14 results on '"Tanner RJ"'
Search Results
2. THE PHE FORTUITOUS DOSIMETRY CAPABILITY BASED ON OPTICALLY STIMULATED LUMINESCENCE OF MOBILE PHONES.
- Author
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Eakins JS, Hager LG, Kouroukla E, Smith RW, and Tanner RJ
- Subjects
- Algorithms, Calibration, England, Humans, Iridium Radioisotopes, Light, Luminescence, Models, Statistical, Monte Carlo Method, Photons, Radiation Dosimeters, Radioactive Hazard Release, Radiometry standards, Reproducibility of Results, Software, Cell Phone, Environmental Exposure analysis, Radiation Dosage, Radiometry instrumentation, Radiometry methods
- Abstract
The Public Health England fortuitous dosimetry capability is reviewed, with particular attention focussed on the derivation of its energy and fading corrections, the Monte Carlo techniques used to generate the calibration factors between phone and body doses, and the procedures set in place to facilitate a reliable and effective service., (© Crown copyright 2016.)
- Published
- 2016
- Full Text
- View/download PDF
3. Measurements with the new PHE neutron survey instrument.
- Author
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Eakins JS, Tanner RJ, and Hager LG
- Subjects
- Calibration, Computer Simulation, England, Fast Neutrons, Models, Theoretical, Monte Carlo Method, Neutrons, Radiation Dosage, Workplace, Equipment Design, Radiometry instrumentation, Radiometry methods
- Abstract
A novel design of survey instrument has been developed to accurately estimate ambient dose equivalent from neutrons with energies in the range from thermal to 20 MeV. The device features moderating and attenuating layers to ease measurement of fast and intermediate energy neutrons, combined with guides that channel low-energy neutrons to the single, central detector. A prototype of this device has been constructed and exposed to a set of calibration fields: the resulting measured responses are presented and discussed here, and compared against Monte Carlo data. A simple simulated workplace neutron field has also been developed to test the device., (© Crown copyright 2013.)
- Published
- 2014
- Full Text
- View/download PDF
4. Individual monitoring for external radiation at accelerator facilities.
- Author
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Tanner RJ and Hager LG
- Subjects
- Beta Particles, Calibration, Environmental Exposure standards, Gamma Rays, Humans, Neutrons, Radiation Dosage, Radiation Monitoring methods, Radiation Protection methods, Radiation Protection standards, Radiometry methods, Guidelines as Topic standards, Occupational Exposure standards, Particle Accelerators instrumentation, Radiation Monitoring standards, Radiometry standards
- Abstract
Individual monitoring at accelerator facilities is discussed, within the framework set out by the International Commission on Radiological Protection and with reference to the implementation of the recommendations of that body within the European Basic Safety Standards. Legislation in other parts of the world may differ, but a worldwide perspective on this subject would be too exhaustive. The fields at accelerator facilities are contrasted in terms of particle type and energy with those encountered at more conventional sites within the nuclear fuel cycle, medical applications and general industry. The implications for individual monitoring are discussed in relation to the dose quantities for these accelerator fields and also with respect to the personal dosemeters options.
- Published
- 2011
- Full Text
- View/download PDF
5. Analysis of the CONRAD computational problems expressing only stochastic uncertainties: neutrons and protons.
- Author
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Gualdrini G, Tanner RJ, Agosteo S, Pola A, Bedogni R, Ferrari P, Lacoste V, Bordy JM, Chartier JL, de Carlan L, Gomez Ros JM, Grosswendt B, Kodeli I, Price RA, Rollet S, Schultz F, Siebert B, Terrissol M, and Zankl M
- Subjects
- Humans, Models, Theoretical, Neutrons, Protons, Stochastic Processes, Radiometry instrumentation, Radiotherapy, Computer-Assisted instrumentation
- Abstract
Within the scope of CONRAD (A Coordinated Action for Radiation Dosimetry) Work Package 4 on Computational Dosimetry jointly collaborated with the other research actions on internal dosimetry, complex mixed radiation fields at workplaces and medical staff dosimetry. Besides these collaborative actions, WP4 promoted an international comparison on eight problems with their associated experimental data. A first set of three problems, the results of which are herewith summarised, dealt only with the expression of the stochastic uncertainties of the results: the analysis of the response function of a proton recoil telescope detector, the study of a Bonner sphere neutron spectrometer and the analysis of the neutron spectrum and dosimetric quantity H(p)(10) in a thermal neutron facility operated by IRSN Cadarache (the SIGMA facility). A second paper will summarise the results of the other five problems which dealt with the full uncertainty budget estimate. A third paper will present the results of a comparison on in vivo measurements of the (241)Am bone-seeker nuclide distributed in the knee. All the detailed papers will be presented in the WP4 Final Workshop Proceedings.
- Published
- 2008
- Full Text
- View/download PDF
6. Achievements in workplace neutron dosimetry in the last decade: lessons learned from the EVIDOS project.
- Author
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Tanner RJ, Bolognese-Milsztajn T, Boschung M, Coeck M, Curzio G, d'Errico F, Fiechtner A, Lillhök JE, Lacoste V, Lindborg L, Luszik-Bhadra M, Reginatto M, Schuhmacher H, and Vanhavere F
- Subjects
- Body Burden, Computer Simulation, Humans, Male, Models, Statistical, Radiation Dosage, Spain, Cyclotrons, Models, Biological, Neutrons, Occupational Exposure analysis, Radiometry methods, Radiometry trends
- Abstract
The availability of active neutron personal dosemeters has made real time monitoring of neutron doses possible. This has obvious benefits, but is only of any real assistance if the dose assessments made are of sufficient accuracy and reliability. Preliminary assessments of the performance of active neutron dosemeters can be made in calibration facilities, but these can never replicate the conditions under which the dosemeter is used in the workplace. Consequently, it is necessary to assess their performance in the workplace, which requires the field in the workplace to be fully characterised in terms of the energy and direction dependence of the fluence. This paper presents an overview of developments in workplace neutron dosimetry but concentrates on the outcomes of the EVIDOS project, which has made significant advances in the characterisation of workplace fields and the analysis of dosemeter responses in those fields.
- Published
- 2007
- Full Text
- View/download PDF
7. Pitfalls and modelling inconsistencies in computational radiation dosimetry: lessons learnt from the QUADOS intercomparison. Part I: Neutrons and uncertainties.
- Author
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Siebert BR, Tanner RJ, Chartier JL, Agosteo S, Grosswendt B, Gualdrini G, Ménard S, Kodeli I, Leuthold GP, Price RA, Tagziria H, Terrissol M, and Zankl M
- Subjects
- Bayes Theorem, Europe, Humans, Models, Statistical, Monte Carlo Method, Radiation Dosage, Reproducibility of Results, Scattering, Radiation, Software, Neutrons, Radiometry methods
- Abstract
The QUADOS EU cost shared action conducted an intercomparison on the usage of numerical methods in radiation protection and dosimetry. The eight problems proposed were intended to test the usage of Monte Carlo and deterministic methods by assessing the accuracy with which the codes are applied and also the methods used to evaluate uncertainty in the answer gained through these methods. The overall objective was to spread good practice through the community and give users information on how to assess the uncertainties associated with their calculated results.
- Published
- 2006
- Full Text
- View/download PDF
8. Pitfalls and modelling inconsistencies in computational radiation dosimetry: lessons learnt from the QUADOS intercomparison. Part II: Photons, electrons and protons.
- Author
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Price RA, Gualdrini G, Agosteo S, Ménard S, Chartier JL, Grosswendt B, Kodeli I, Leuthold GP, Siebert BR, Tagziria H, Tanner RJ, Terrissol M, and Zankl M
- Subjects
- Angioplasty methods, Bayes Theorem, Brachytherapy methods, Calibration, Europe, Eye Neoplasms radiotherapy, Humans, Models, Statistical, Radiation Dosage, Reproducibility of Results, Scattering, Radiation, Electrons, Photons, Radiometry methods
- Abstract
'QUADOS', a concerted action of the European Commission, has promoted an intercomparison aimed at evaluating the use of computational codes for dosimetry in radiation protection and medical physics. This intercomparison was open to all users of radiation transport codes. Eight problems were selected for their relevance to the radiation dosimetry community, five of which involved photon and proton transport. This paper focuses on a discussion of lessons learned from the participation in solving the photon and charged particle problems. The lessons learned from the participation in solving the neutron problems are presented in a companion paper (in this issue).
- Published
- 2006
- Full Text
- View/download PDF
9. QUADOS intercomparison: a summary of photon and charged particle problems.
- Author
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Gualdrini G, Agosteo S, Ménard S, Price RA, Chartier JL, Grosswendt B, Kodeli I, Leuthold GP, Siebert BR, Tagziria H, Tanner RJ, Terrissol M, and Zankl M
- Subjects
- European Union, Models, Biological, Models, Statistical, Radiation Dosage, Radiation, Ionizing, Reproducibility of Results, Sensitivity and Specificity, Algorithms, Photons therapeutic use, Quality Assurance, Health Care methods, Radiation Protection methods, Radiometry methods, Software, Software Validation
- Abstract
QUADOS, a Concerted Action of the European Commission, has promoted an intercomparison aimed at evaluating the use of computational codes for dosimetry in radiation protection and medical physics. This intercomparison was open to all users of radiation transport codes. Eight problems were selected for their relevance to the radiation dosimetry community, five of which involved photon and proton transport. This paper focuses on the analysis of the photon and charged particle problems. The neutron problems were presented in a paper at the NEUDOS9 conference.
- Published
- 2005
- Full Text
- View/download PDF
10. Modelling of neutron survey instrument performance and experimental validation of those calculated response data.
- Author
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Tanner RJ, Bartlett DT, Hager LG, Jones LN, Molinos C, Roberts NJ, Taylor GC, and Thomas DJ
- Subjects
- Computer Simulation, Equipment Design, Equipment Failure Analysis, Monte Carlo Method, Radiation Dosage, Radiation Protection methods, Radiometry methods, Reproducibility of Results, Sensitivity and Specificity, Computer-Aided Design, Models, Statistical, Neutrons, Radiation Protection instrumentation, Radiometry instrumentation
- Abstract
Three moderator-type neutron survey instruments have been modelled for energy and angle dependence of the response, in greater detail than before. These response data have been verified by comparison with published experimental measurements and measurements made specifically for this project. Influences on the instrument response have also been investigated. These have included its mode-of-use and perturbations caused by variations in the instrument manufacture. The implications of these new response data have been assessed by an extensive programme of folding the responses with workplace energy distributions.
- Published
- 2005
- Full Text
- View/download PDF
11. The use of passive personal neutron dosemeters to determine the neutron dose equivalent component of radiation fields in spacecraft.
- Author
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Bartlett DT, Hager LG, and Tanner RJ
- Subjects
- Body Burden, Environmental Exposure analysis, Equipment Design, Equipment Failure Analysis methods, Internationality, Radiation Dosage, Radiation Protection methods, Radioisotopes analysis, Radiometry methods, Relative Biological Effectiveness, Reproducibility of Results, Sensitivity and Specificity, Space Flight methods, Cosmic Radiation, Neutrons, Occupational Exposure analysis, Radiometry instrumentation, Space Flight instrumentation, Transducers
- Abstract
For the altitude range and inclination of the International Space Station (ISS), secondary neutrons can be a major contributor to dose equivalent inside a spacecraft. The exact proportion is very dependent on the amount of shielding of the primary galactic cosmic radiation and trapped particles, but is likely to lie in the range of 10-50%. Personal neutron dosemeters of simple design, processed using simple techniques developed for personal dosimetry, may be used to estimate this neutron component.
- Published
- 2004
- Full Text
- View/download PDF
12. Angle dependence of response characteristics of neutron survey instruments.
- Author
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Roberts NJ, Bartlett DT, Hager LG, Jones LN, Molinos C, Tanner RJ, Taylor GC, and Thomas DJ
- Subjects
- Environmental Exposure analysis, Equipment Design, Radiation Dosage, Radiation Protection methods, Radiometry methods, Reproducibility of Results, Sensitivity and Specificity, Equipment Failure Analysis methods, Neutrons, Occupational Exposure analysis, Radiation Protection instrumentation, Radiometry instrumentation, Transducers
- Abstract
Neutron area survey instruments are designed to have an approximately isotropic response. In practice, the response cannot be perfectly isotropic for instruments that do not have spherical symmetry, and for all instruments it is modified by the inclusion of batteries, electronics, handles, etc. This affects the ability of the survey instrument to measure accurately an isotropic dose equivalent quantity. Measurements of the angle dependence of response for four of the most commonly used designs of survey instrument (Harwell 0949, Mark 7 NRM, NM2 and Studsvik 2202D) have been performed in a low-scatter room using radionuclide and monoenergetic neutron sources. The Monte Carlo code MCNP has been used to model the responses and to investigate their sensitivity to the polyethylene density, counting gas pressure and other manufacturing tolerances. Preliminary modelling results are presented here.
- Published
- 2004
- Full Text
- View/download PDF
13. Intercomparison on the usage of computational codes in radiation dosimetry.
- Author
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Tanner RJ, Chartier JL, Siebert BR, Agosteo S, Grosswendt B, Gualdrini G, Kodeli I, Leuthold GP, Ménard S, Price RA, Tagziria H, Terrissol M, and Zankl M
- Subjects
- Body Burden, Calibration, Environmental Monitoring instrumentation, Environmental Monitoring methods, Humans, Numerical Analysis, Computer-Assisted, Quality Assurance, Health Care methods, Radiation Dosage, Radiation Protection instrumentation, Radiometry instrumentation, Relative Biological Effectiveness, Reproducibility of Results, Risk Assessment trends, Risk Factors, Safety Management methods, Sensitivity and Specificity, Software, Algorithms, Neutrons, Occupational Exposure analysis, Radiation Protection methods, Radiometry methods, Risk Assessment methods, Software Validation
- Abstract
'QUADOS', a Concerted Action of the European Commission, has run an intercomparison aimed at evaluating the use of computational codes for dosimetry in radiation protection and medical physics. This intercomparison was open to all users of Monte Carlo, analytic and semi-analytic codes or deterministic methods. Its main aim was to provide a snapshot of the methods and codes currently in use. It also intended to furnish information on the methods used to assess the reliability of computational results and disseminate 'good practice' throughout the radiation dosimetry community. Eight problems were selected for their relevance to the radiation dosimetry community, three of which involve neutron transport. This paper focuses on the analysis of the neutron problems.
- Published
- 2004
- Full Text
- View/download PDF
14. Practical implications of neutron survey instrument performance.
- Author
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Tanner RJ, Bartlett DT, Hager LG, Jones LN, Molinos C, Roberts NJ, Taylor GC, and Thomas DJ
- Subjects
- Body Burden, Calibration, Environmental Monitoring instrumentation, Environmental Monitoring methods, Equipment Design, Humans, Quality Assurance, Health Care methods, Radiation Dosage, Radiation Protection methods, Radiometry methods, Relative Biological Effectiveness, Reproducibility of Results, Risk Assessment trends, Risk Factors, Safety Management methods, Sensitivity and Specificity, Algorithms, Equipment Failure Analysis methods, Neutrons, Occupational Exposure analysis, Radiation Protection instrumentation, Radiometry instrumentation, Risk Assessment methods
- Abstract
Improvements have been made to the Monte Carlo modelling used to calculate the response of the neutron survey instruments most commonly used in the UK, for neutron energies up to 20 MeV. The improved modelling of the devices includes the electronics and battery pack, allowing better calculations of both the energy and angle dependence of response. These data are used to calculate the response of the instruments in rotationally and fully isotropic, as well as unidirectional fields. Experimental measurements with radionuclide sources and monoenergetic neutron fields have been, and continue to be made, to test the calculated response characteristics. The enhancements to the calculations have involved simulation of the sensitivity of the response to variations in instrument manufacture, and will include the influence of the user and floor during measurements. The practical implications of the energy and angle dependence of response, variations in manufacture, and the influence of the user are assessed by folding the response characteristics with workplace energy and direction distributions.
- Published
- 2004
- Full Text
- View/download PDF
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