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Tesi sul tema "Radiation – Safety measures"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 27 luglio 2024

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1

吳楚儀 and Chor-yi Ng. "Radiation hazards of building materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B3121051X.

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2

Aldridge, Jesse Philmore. "The role of health physicists in contemporary radiological emergency response." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19434.

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3

Campos, Carlos Austerlitz. "Choice of personnel dosimeter location to assess the effective dose equivalent for various photon irradiations." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/12916.

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4

Veinot, Kenneth Guy. "An angular dependent neutron effective-dose-equivalent dosimeter." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17595.

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5

Griffis, Neale Jeff. "Performance evaluation of the Dosicard electronic personal dosimeter." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16991.

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6

Johnston, Glen Harvey George. "Evaluation of radiation and dust hazards associated with mineral sand processing." Thesis, Queensland University of Technology, 1988. https://eprints.qut.edu.au/35942/1/35942_Johnston_1988.pdf.

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Possible health hazards have been investigated in a mineral sand processing plant to determine the risks to workers contributed by four principal sources: (i) External gamma radiation ii) Inhaled radioactivity in airborne dust particles (iii) Inhaled activity from airborne radon and radon daughter isotopes (iv) Respirable free silica Gamma radiation surveys of the plant working environs using a portable survey meter indicated possible exposure rates ranging from 70 nSv h-1 to a maximum of 50 μsv h- 1 (near a large pile of monazite sand). The average exposure rate was 400 nSv h-1 • Assuming

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7

Fulcher, TJ. "The development of an interlock and control system for a clinical proton therapy system." Thesis, Cape Technikon, 1995. http://hdl.handle.net/20.500.11838/1483.

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Thesis (Masters Diploma (Technology))--Cape Technikon, Cape Town, 1995<br>The development of a 200 MeV clinical proton therapy facility at the National Accelerator Centre required an interlock and control system to supervise the delivery of radiation to a patient. The interlock and control system is responsible for ensunng that nobody enters the treatment vault during an irradiation, the extraction of the beamstop devices 'from the beam-line to allow the irradiation of the patient and the insertion of those beam-stop devices when an error condition is detected. Because of its nature, th

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8

Tenkate, Thomas D. "Ultraviolet radiation exposure of welders." Thesis, Queensland University of Technology, 1994. https://eprints.qut.edu.au/36715/1/36715_Digitised%20Thesis.pdf.

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Ultraviolet radiation (UVR) is a by-product of the welding process and is emitted by the arc formed between the electrode and the base metal. Exposure to UVR can produce acute and chronic effects on the eyes and skin, including photokeratitis and erythema (acute), and pterygium and skin cancer (chronic). The measurement of UVR can be used to determine the level of hazard posed by a particular source. The personal UVR exposure levels of a group of welders and nearby workers was estimated using a photosensitive polymer film, polysulphone. The polysulphone film was attached to eye protection,

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9

Elmukhtar, Yasir Mohamed. "Knowledge and attitude of dentists regarding radiation safety in government dental clinics in Khartoum, Sudan." University of the Western Cape, 2015. http://hdl.handle.net/11394/5037.

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Magister Scientiae Dentium - MSc(Dent)<br>The level of knowledge and the attitude of dentists regarding radiation safety will have a direct impact on patient exposure to radiation. Aim: The aim of the present study was to evaluate the knowledge and attitude of dentists regarding radiation safety in government dental clinics in Khartoum, Sudan. Materials and Methods: A cross-sectional study using an administered structured questionnaire was carried out. The questionnaire consisted of 13 questions that included the demographic data of dentists, basic knowledge regarding radiation safety, knowled

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10

Salikin, Md Saion. "An improved system of damage limitation for better risk control in radiological protection near environmental level." Thesis, University of St Andrews, 1995. http://hdl.handle.net/10023/13372.

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In radiological protection, models are used to assess radiation risk by means of extrapolation from high dose and dose rate to low dose and dose rate. In this thesis five main biophysical models of radiation action have been evaluated, appraised and inter-compared. The five models are lethal and potentially lethal (LPL) by Curtis, pairwise lesion interaction (PLI) by Harder, cellular track structure (CTS) by Katz, hit size effectiveness (HSE) by Bond and Varma and track core (TC) by Watt. Each model has been developed based on certain underlying mechanisms or phenomena, to permit interpretatio

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11

Jalandoni, D. Jay Moreno. "In-phantom measurement of HE or neutron protection dosimetry." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/16777.

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12

Shika, Matsepane Rebecca. "Radiation safety standards at public hospitals in Limpopo Province, South Africa." Thesis, University of Limpopo (Turfloop Campus), 2012. http://hdl.handle.net/10386/859.

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13

Murray, Bryon Michael. "Determination of eye dose from personnel monitoring devices in medical institutions." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17040.

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14

陳木華 and Mok-wah Chan. "Exposures to artificial sources of ionising radiation in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31208496.

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15

Zakariya, Nasiru Imam. "Development of nuclear-radiological facility monitoring system." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2182.

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Thesis (DTech (Electrical Engineering))--Cape Peninsula University of Technology, 2016.<br>The widespread application of nuclear science and technology has been the subject of much concern as well as nuclear safety issues. And to ensure the safety of public life, property and environment, it is indispensable to improve the emergency system for nuclear accidents and the environmental monitoring system for nuclear radiation, so that the occurrence of nuclear accidents, terrorist incidents and the resulting hazards can be prevented or minimized. Due to the benefits of radiation which were earlier

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16

Jeyaretnam, Joseph S. "Occupational hazards and radiation safety in veterinary practice including zoo veterinary practice in Australia." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2003. https://ro.ecu.edu.au/theses/1306.

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This thesis contains reviews and research on the occupational hazards of zoo veterinary practitioners in Australia. Although occupational hazards have long been recognised in the veterinary profession, little information is available on the number and magnitude of injuries to veterinarians in Australia, the United Kingdom or the United States. Apart from anecdotal accounts and some limited data, most of the available information is on occupational zoonoses, generally well recognized by veterinarians. Other occupational hazards to which veterinarians are exposed have received scant attention. T

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17

Ghassemi, Hamed 1964. "Design and simulation of an improved operational amplifier for use in radiation environments." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276987.

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The effects of radiation on an operational amplifier were investigated through simulation. The μA 741 was simulated using Spice. Under normal conditions the 741 had the following properties: offset Voltage (Vos) of 0.8 mV, bias current (IB) of 27 nA, offset current (Ios) of 1 nA, and an open loop gain (A0.1.) of 112 dB. When exposed to neutron fluence of 5 x 10¹³ n/cm², these parameters changed to offset voltage of 45 mV, bias current of 1500 nA, offset current of 500 nA, and an open loop gain of 66 dB. A new circuit is proposed that provides improvements in the above parameters. The modified

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18

Van, der Walt Jacobus Gert. "Radiation field shaping through low temperature thermal-spray in radiotheraphy." Thesis, Bloemfontein : Central University of Technology, Free State, 2009. http://hdl.handle.net/11462/116.

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Thesis (D. Tech.) -- Central University of Technology, Free State, 2009<br>Superficial cancerous lesions are commonly treated through low energy X-ray or electron radiation in radiotherapy. The treatment units that produce the radiation are equipped with square, rectangular and round applicators of different sizes. These applicators attach to the treatment units and define the radiation field size applied during treatment. An applicator is chosen to fit the shape of the cancerous lesion on the patient as closely as possible. Since cancerous lesions are irregular in shape, there will always be

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19

Ho, Wing-kwok, and 何永國. "Solar ultraviolet radiation: monitoring, dosimetry and protection." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222675.

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20

Peters, Nazlea Behardien. "Determination of effective dose and entrance skin dose from dose area product values for barium studies in adult patients at a large tertiary hospital in the Western Cape." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2627.

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Thesis (MSc (Radiography))--Cape Peninsula University of Technology, 2018.<br>Background and objectives The issue of patient doses received during fluoroscopy procedures, raised concerns for the researcher, as there may have been probable past skin injuries or deterministic injuries that may not have been documented. Amongst the radiology staff, there was very little understanding of what the actual dose area product (DAP) value means in real terms of effective dose and entrance skin dose. The aims of the study were to: i) Measure the radiation doses received by the patient and determine a s

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21

Meldrum, Lennox R. "Estimate of lifetime UV exposure for selected workers in South East Queensland." Thesis, Queensland University of Technology, 1998.

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22

Seydaliev, Marat Radikovich. "Development and Test of a GEM-Based TEPC for Neutron Protection Dosimetry." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14607.

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The effective dose equivalent, H (or the effective dose, E ) to an individual is the primary limiting quantity in radiation protection. However, techniques for measuring H for neutrons have not been fully developed. In this regard a new tissue equivalent proportional counter (TEPC) based on a gas electron multiplier (GEM) for measuring H*(10), which is a conservative estimate of H, for neutrons was designed and constructed. The deposited energy distribution for two different neutron sources (a Cf-252 source and a AmBe source) was measured using the new TEPC. The measurements were performed us

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23

Ho, Chi-wai, and 何志偉. "Radiation dose due to indoor radon and its progeny in Hong Kong and a study of mitigation methods to control indoor radon exposure." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31236972.

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24

Vishvakarman, Devasenapathy. "Occupational exposure to ultraviolet radiation in Central Queensland." Thesis, Queensland University of Technology, 1999.

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25

Jeffries, Cameron. "Radiological exposure due to radioactivity carrying aerosols in a mineral sand processing plant." Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/37123/7/37123_Digitised%20Thesis.pdf.

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Mineral sand processing involves a radiological risk due to uranium and thorium series isotopes. Characterising the radioactive aerosol requires measurement of the activity size distribution and the isotopic composition of the aerosol. This is a time consuming process requiring long sampling times and sample counting after a suitable delay time. As a result a number of weeks are required to complete analysis of the activity size distribution. Instrumentation is now available that determines the number and mass distribution within a matter of minutes. Measurements of activity, number and ma

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26

Lopes, Pedro Henrique Silvestre. "Utilização do mapa espacial de radiação e dose acumulada como ferramenta para otimização de doses em pacientes e trabalhadores nas clínicas de medicina nuclear." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1705.

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Esse estudo tem por objetivo geral propor um mapa espacial de doses como ferramenta auxiliar na avaliação da necessidade de otimização de ambientes em serviços de medicina nuclear e, por objetivos específicos, avaliar as dosimetrias individuais dos trabalhadores; analisar a estrutura física dos serviços de medicina nuclear; avaliar as taxas de dose do ambiente. A pesquisa realizada se caracteriza como um estudo de caso, de natureza exploratória e explicativa, em três Serviços de Medicina Nuclear estabelecidos na região Noroeste do Estado do Paraná. Os resultados obtidos indicaram que as taxas

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27

Stoneham, Melissa J. "Healthy public policy in local government facilitating and inhibiting factors: Shade creation as a case study." Thesis, Queensland University of Technology, 2001. https://eprints.qut.edu.au/36761/1/36761_Digitised%20Thesis.pdf.

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Sun safe behaviour is a modifiable behaviour and therefore the potential for change is large. Targeted interventions that use multi-strategy or healthy public policy approaches may be successful at increasing sun safe behaviours and creating supportive environments that promote positive health outcomes. This research considered sun safety, and more specifically shade creation, within the domain of public places that integrate human leisure-time exposure to ultraviolet radiation (UVR). It was felt that the potential for behaviour change through the adoption of healthy public policy was probably

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28

Flaspoehler, Timothy Michael. "FW-CADIS variance reduction in MAVRIC shielding analysis of the VHTR." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45743.

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In the following work, the MAVRIC sequence of the Scale6.1 code package was tested for its efficacy in calculating a wide range of shielding parameters with respect to HTGRs. One of the NGNP designs that has gained large support internationally is the VHTR. The development of the Scale6.1 code package at ORNL has been primarily directed towards supporting the current United States' reactor fleet of LWR technology. Since plans have been made to build a prototype VHTR, it is important to verify that the MAVRIC sequence can adequately meet the simulation needs of a different reactor technology

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29

Santos, Romilda Prado dos. "Exposição ocupacional às radiações ionizantes durante cirurgias ortopédicas guiadas fluoroscopicamente." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/331.

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A Radiologia tem sido considerada uma das áreas da Medicina que mais se desenvolve, especialmente com o aporte de novas tecnologias. Entre as aplicações da Radiologia Intervencionista destaca-se a utilização da fluoroscopia no centro cirúrgico em complemento às cirurgias ortopédicas, objeto da presente pesquisa. Entretanto, alguns complexos e longos procedimentos guiados fluoroscopicamente podem resultar em altos níveis de exposição ocupacional às radiações ionizantes para equipe de cirurgia ortopédica e trabalhadores de saúde, induzir sérios danos à saúde. Levando em conta esses aspectos, o

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30

Wooten, Hasani Omar. "Time-Dependent Neutron and Photon Dose-Field Analysis." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7153.

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A unique tool is developed that allows the user to model physical representations of complicated glovebox facilities in two dimensions and determine neutral-particle flux and ambient dose-equivalent fields throughout that geometry. The code Pandemonium, originally designed to determine flux and dose rates only, has been improved to include realistic glovebox geometries, time-dependent source and detector positions, time-dependent shielding thickness calculations, time-integrated doses, a representative criticality accident scenario based on time-dependent reactor kinetics, and more rigorous ph

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31

De, Brouwer Christophe. "Analyse des diverses réglementations concernant la radioprotection: sur les plans international et national et examen de leurs cohérences par rapport aux données actualisées de radiobiologie." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211530.

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32

Porto, Lorena Elaine. "Avaliação da dose em pacientes pediátricos submetidos a exame de tomografia computadorizada." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1070.

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CAPES<br>A dosimetria em tomografia computadorizada (TC) envolve desde a determinação de grandezas dosimétricas específicas de TC até a estimativa de dose absorvida e dose efetiva. Entretanto, deve-se considerar que por envolver radiação ionizante no seu processo, este procedimento apresenta riscos inerentes e sua utilização deve ponderar o custo e o benefício propiciado pelo procedimento. A proteção de pacientes submetidos a exames radiológicos, de uma maneira geral, é determinada pelos princípios da “justificação” e “otimização”. Desta forma, torna-se importante o conhecimento dos níveis de

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33

Modiba, Reshoketswe Mokgadi. "Compliance to radiation safety standards by radiographers and dental professionals in Waterberg District Hospitals, Limpopo Province." Thesis, 2014. http://hdl.handle.net/10386/1369.

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Thesis (MPH. ) --University of Limpopo, 2014<br>This dissertation reports on findings from a qualitative research that sought to investigate adherence and compliance to radiation safety protocols by radiographers and dental professionals in the Waterberg District. The study also sought to determine the knowledge the participants had on the chronic ill-effects of occupational exposure to radiation, safety protocols and their professional experience in dealing with occupational exposure to radiation. Altogether 60 participants from 8 health institutions in the Waterberg district took part in th

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34

Fundak, Robert. "Rapid establishment of emergency action areas as a consequence of large scale radioactive material releases from fixed nuclear facilities." Thesis, 1995. http://hdl.handle.net/1957/35225.

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Rapid emergency response decisions from a radiation release are necessary in order to prevent the general public from being exposed to a potential radiation hazard. A one meter exposure rate measurement is all that is necessary to establish relocation and food control areas when the ground is contaminated at the Protective Action Guide minimum response levels. With the results of these calculations, a known one meter exposure rate is all that is necessary to establish relocation and food control areas for a release from the WNP-2 commercial nuclear power plant or a release from a waste tank at

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35

Kros, Charles. "Radiological dose assessment for the leaking coil replacement on the Necsa radioactive effluent evaporator facility." Thesis, 2014.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2013.<br>In this study a dose assessment is used to demonstrate conformance to national and international dose limits for workers and meets the Necsa ALARA goals for a radiological repair task. The dose assessment methodology is based on international standards, principles and criteria and involves the process of determining radiological dose, through the use of exposure scenarios, bioassay results, monitori

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36

Feeney, Donovan L. "An analysis of secondary radiation doses in a South African neonatal high care unit." Thesis, 2019. https://hdl.handle.net/10539/29854.

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A research report submitted to the Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree of Master of Medicine in Diagnostic Radiology Johannesburg 2019<br>Introduction: Neonates in a neonatal ICU or high care unit are a high-risk population. Besides a vulnerability to medical and surgical conditions, which often require radiological investigation, they are also at risk from the effects of radiation used in imaging. These risks increase with radiation dose. Numerous studies have assessed the dose due to

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37

Kegopotsemang, Onalenna. "Evaluation and redesign of radiation shielding in a radionuclide production facility at a particle accelerator / Onalenna Kegopotsemang." Thesis, 2004. http://hdl.handle.net/10394/11338.

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iThemba LABS is a particle accelerator facility housing a radionuclide production facility that uses a 66 MeV proton beam to produce radionuclides for medical and industrial use. Ionising radiation is produced by a variety of sources at Themba LABS. Ionising is a health hazard. High doses can cause acute radiation syndrome, i.e. "radiation sickness". Lower doses cannot cause acute symptom, but carry a risk of radiation-related cancer. Ionising radiation is also detrimental to materials, and can damage polymers and lubricants e.g. Shielding is used to reduce radiation levels to values that shou

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38

Bartolo, William Charles Francis Safety Science Faculty of Science UNSW. "Radioisotope laboratory safety auditing, compliance and associated problems in NSW." 2007. http://handle.unsw.edu.au/1959.4/40787.

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This thesis reports on the modification of the "Safecode" computer-program to monitor the safety of radio-isotope laboratories, and its application to 24 compliance audits in NSW during the period 1999 to 2006. Additionally, an attempt was made to predict the level of risk to persons working within those laboratories. Based on the current NSW radiation control legislation and the relevant Australian Standards a comprehensive audit checklist was developed for this project. Each safety requirement in those documents was used to develop a question, resulting in 187 questions in the checklist.

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Doodoo-Amoo, David Nii. "Development of composite materials for non-leaded glove for use in radiological hand protection." 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3077629.

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Mallory, Stacy L. "An analysis of shielding requirements in conjunction with current radiographic imaging practices." Thesis, 2003. http://hdl.handle.net/1957/30865.

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The National Council of Radiation Protection and Measurements Report No. 49, originally issued on September 15, 1976, has been the primary design guide for diagnostic x-ray structural shielding in the United States. To further protect the public from various areas of medical radiation exposure, NCRP issued Report 116 in 1987 to decrease the public exposure limits. These new limits used in conjunction with NCRP 49 to determine shielding requirements for diagnostic radiological rooms can be shown to over-shield based on current technologies and protocols. This paper explores the NCRP conservativ

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Gerstenmaier, Jan Frank. "Public health implications of medical diagnostic radiation exposure." Diss., 2012. http://hdl.handle.net/10500/6085.

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Radiation from Computed Tomography (CT) is now the major contributor to population radiation dose. Despite controversy around the dose-effect relationship of radiation from CT, the linear non-threshold (LNT) theory is endorsed by many authorities, and constitutes the basis of cancer risk estimates. The purpose of this study was (1) a literature review of radiobiological theories, and methods of dose saving stategies in CT; (2) to highlight the importance of dose saving in CT, and to demonstrate how dose can be saved in a radiology department: Following a 40% reduction in reference X-ray

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Shih, Han. "Step-growth thiol-ene photopolymerization to form degradable, cytocompatible and multi-structural hydrogels." Thesis, 2014. http://hdl.handle.net/1805/3842.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Hydrogels prepared from photopolymerization have been used for a variety of tissue engineering and controlled release applications. Polymeric biomaterials with high cytocompatibility, versatile degradation behaviors, and diverse material properties are particularly useful in studying cell fate processes. In recent years, step-growth thiol-ene photochemistry has been utilized to form cytocompatible hydrogels for tissue engineering applications. This radical-mediated gelation scheme utilizes norbornene functionalized multi-arm poly(eth

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