Synthesis of OSL nanophosphor Li 3 B 7 O 12 :Mn and its dosimetric properties
The present paper reports the structural, morphological and optical properties of nanophosphor Li 3
B 7 O 12 :Mn with an optimised dopant concentration of 0.25 mol% and its surface modification under
the irradiation of 250 keV proton beams and gamma photons for ion fluence ranging from 1  × 10 13 to
6.25  × 10 15 ions cm −2 and doses from 100 mGy–100 Gy, respectively. This nanophosphor has been
synthesised by the high temperature solid state reaction method. Its optical properties are
characterised by optically stimulated luminescence (OSL) and thermo luminescence (TL) techniques.
This nanophosphor is polyc...
Source: Journal of Radiological Protection - October 9, 2018 Category: Physics Authors: Mini Agarwal, K Asokan, S K Garg, E Dhamija and Pratik Kumar Source Type: research
Introducing the concept of the isodose for optimisation of decontamination activities in a
radioactive fallout scenario
In the recovery phase after a radioactive release incident, it is important to be able to focus
decontamination operations on the areas that contribute most to the radiation dose. Monte Carlo
simulations were applied to determine the shielding effect of a building against radiation from
various directions, also giving information on the dose contributions at various locations inside
the building from specific areas outside. The concept of the isodose was developed to optimise
decontamination activities, and was applied as isodose lines to define the smallest areas that lead
to a certain dose reduction through deconta...
Source: Journal of Radiological Protection - September 20, 2018 Category: Physics Authors: Y Hinrichsen, R Finck, C R ääf and K G Andersson Source Type: research
Equivalent thicknesses of beam hardening filters consisting of aluminium, copper, Al/Cu and Al/Gold
combinations and plumbiferous acrylic for 40 to 150 kVp diagnostic spectra
Purpose : Beam hardening filters used to reduce patient doses typically consist of aluminium,
copper, or a combination of both. Optically transparent filters containing lead in plumbiferous
acrylic became available. One vendor also uses a combination of aluminium and gold. Data is provided
to compare filter thicknesses in terms of half-value layer (HVL) for clinically relevant kVp.
Methods : Equivalent filter thicknesses were defined by identical kVp and 1st HVL. Equivalent copper
filter thicknesses were calculated for aluminium and typical filters found in radiographic and
interventional systems. A verified semi-emp...
Source: Journal of Radiological Protection - September 12, 2018 Category: Physics Authors: Peter Homolka and Michael Figl Source Type: research
Influence of the SPECT calibration source position on the absorbed dose calculation for 131 I-NaI
therapy using GATE simulations
Many research groups have studied nuclear medicine image quantification to improve its accuracy in
dose estimation. This work aims to evaluate the influence of the source calibration position for
absorbed dose calculation for a 131 I-NaI therapy using Monte Carlo (MC) simulations. The
calibration approach consisted of a cylindrical phantom filled with water. A cylindrical 131 I
source with 361.1 ± 3.6 kBq ml −1 was positioned at the center of the phantom and its outer part.
Images were acquired with 150 00 counts per projection image acquired with SPECT detector (high
counts density —HCD) and 3000 counts per pro...
Source: Journal of Radiological Protection - September 12, 2018 Category: Physics Authors: Samira M Carvalho, Ana P M Costa, Celso D Ramos, Jo ão H M Castelo, Sérgio Q Brunetto and Daniel A B Bonifácio Source Type: research
Internal doses from radionuclides and their health effects following the Fukushima accident
This paper presents an overview of current internal dose estimates from the Fukushima accident,
potential population specific uncertainties in these estimates are investigated, along with the
relative effects of internal and external exposures. Thyroid doses were largely due to 131 I, but
variations in thyroid weight and fractional uptake and retention times of 131 I in the thyroid
contribute to uncertainties in thyroid dose estimates. Lower values for these parameters in the
Japanese population, as compared to international reference assumptions, would lead to
underestimation of doses on the basis of reference thyro...
Source: Journal of Radiological Protection - September 12, 2018 Category: Physics Authors: Tetsuo Ishikawa, Masaki Matsumoto, Tatsuhiko Sato, Ichiro Yamaguchi and Michiaki Kai Source Type: research
Highlights of articles in this issue
Highlights of the articles in this issue are given in the PDF file. (Source: Journal of Radiological Protection)
Source: Journal of Radiological Protection - September 3, 2018 Category: Physics Source Type: research
Radiation therapy facility risk analysis in Brazil with SEVRRA software
Risk assessment deals with processes, accident-initiating events, barriers and risk ratings to
unveil the fragility and weakness of some processes; within this study, specifically related to
radiation therapy facilities. Barriers are technical or organizational safety measures put in place
to avoid, prevent, detect, control, reduce or mitigate the consequences of an accident once an
initiating event has occurred. In this work, radiological risk analysis was performed for a set of
20 Brazilian radiotherapy facilities making use of the freeware sevrra risk-management software. The
objective of this study was to define ...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: G S Joana, M S Nogueira, E Sandrini, G Bittencourt, H Salmon, L Fairbanks, S S Fortes, C Salata, F C Teixeira and M Gon çalves Source Type: research
Implications of recent epidemiologic studies for the linear nonthreshold model and radiation
protection
The recently published NCRP Commentary No. 27 evaluated the new information from epidemiologic
studies as to their degree of support for applying the linear nonthreshold (LNT) model of
carcinogenic effects for radiation protection purposes (NCRP 2018 Implications of Recent
Epidemiologic Studies for the Linear Nonthreshold Model and Radiation Protection, Commentary No. 27
(Bethesda, MD: National Council on Radiation Protection and Measurements)). The aim was to determine
whether recent epidemiologic studies of low-LET radiation, particularly those at low doses and/or
low dose rates (LD/LDR), broadly support the LNT mo...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: R E Shore, H L Beck, J D Boice, E A Caffrey, S Davis, H A Grogan, F A Mettler, R J Preston, J E Till, R Wakeford, L Walsh and L T Dauer Source Type: research
Eye lens dose monitoring in the UK nuclear industry using active personal dosemeters
The reduction of the dose limit for eye lens from 150 to 20 mSv yr −1 must be implemented by EU
member states by February 2018. Consequently, there is a requirement for all employers engaged with
work with ionising radiation to have appropriate monitoring arrangements in place by this date to
demonstrate that they can meet this new limit for all workers. Eye lens dose is conventionally
monitored by specific dosemeters worn near the eye. However, it is usually impractical for these
dosemeters to be worn at all times in the workplace which can lead to problems accounting for any
periods of work when an eye lens dosem...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: A McWhan and W Dobrzynska Source Type: research
Performance of radon monitors in a purpose-built radon chamber
The purpose of this paper is to benchmark several different radon monitors, by quantifying their
accuracy and response time. Radon monitors with different characteristics were tested in a
purpose-built radon chamber under reference conditions. The radon concentration in the chamber was
controlled and maintained at a stable radon concentration of (2648  ± 85) Bq m −3 to evaluate the
accuracy and precision of these monitors. The response time of the monitors was analysed for two
time intervals. To assess the response time of the monitors, radon concentration was varied from a
theoretical value of 0 –6441 Bq m âˆ...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: Marta Fuente, Daniel Rabago, Sixto Herrera, Luis Quindos, Ismael Fuente, Mark Foley and Carlos Sainz Source Type: research
Comment on ‘Radiological protection and the exposure of animals as patients in veterinary medicine’
Description unavailable (Source: Journal of Radiological Protection)
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: C H Clement Source Type: research
Corrigendum: Direct adjustment for confounding by smoking reduces radiation-related cancer risk
estimates of mortality among male nuclear workers in Japan, 1999 –2010 (2018 J. Radiol. Prot. 38
[http://doi.org/10.1088/1361-6498/aaa65c] 357 )
Description unavailable (Source: Journal of Radiological Protection)
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: Shin ’ichi Kudo, Jun’ichi Ishida, Keiko Yoshimoto, Shoichi Mizuno, Sumio Ohshima, Hiroshige Furuta and Fumiyoshi Kasagi Source Type: research
Comment on Environmental monitoring through the use of silica-based TLD 2017 J. Radiol. Prot. 37
761 –779 [http://doi.org/10.1088/1361-6498/aa770e]
Description unavailable (Source: Journal of Radiological Protection)
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: Keith Stammers Source Type: research
SUDOQU, a new dose-assessment methodology for radiological surface contamination
A new methodology has been developed for the assessment of the annual effective dose resulting from
removable and fixed radiological surface contamination. It is entitled SUDOQU (SUrface DOse
QUantification) and it can for instance be used to derive criteria for surface contamination related
to the import of non-food consumer goods, containers and conveyances, e.g., limiting values and
operational screening levels. SUDOQU imposes mass (activity)-balance equations based on radioactive
decay, removal and deposition processes in indoor and outdoor environments. This leads to
time-dependent contamination levels that may ...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: Teun van Dillen and Arjan van Dijk Source Type: research
Uranium content in groundwater by laser fluorimetry; method validation and dose assessment
In this study, the total uranium concentration was determined in groundwater samples used for
irrigation and/or drinking purposes and collected from private wells in Al Sharqiya region, Saudi
Arabia. The uranium concentrations were measured by laser fluorimetry preceded by radiochemical
treatment to eliminate the quenching effect due to the high total dissolved solids content in the
groundwater samples. For method validation, some of the measured samples were analyzed for uranium
isotopic activities and measured by alpha spectrometry. The results of the uranium concentrations
obtained by laser fluorimetry and alpha s...
Source: Journal of Radiological Protection - August 30, 2018 Category: Physics Authors: A Al-Muqrin, A El-Sharkawy and W M Abdellah Source Type: research
