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An optimized method for neutron dose evaluation based onNa activity distribution in the human body.
J Radiol Prot
February 2023
Beijing Institute of Radiation Medicine, Beijing, People's Republic of China.
The neutron dose resulting from external irradiation can be evaluated by measuring the counts of characteristicrays produced byNa in the human body. The detection geometry with the highest detection efficiency for measuring the whole-bodyNa activity has not been studied. In this work, the MCNP code is used to calculate the spatial distribution ofNa in the human body irradiated by neutrons with different energies in different irradiation geometries.
View Article and Find Full Text PDFEvaluation of sodium activation distribution in the PMMA water phantom after fast neutron irradiation.
Appl Radiat Isot
November 2013
Korea Institute of Radiological and Medical Sciences (KIRAMS), Seoul 139-706, Republic of Korea.
(24)Na produced by the neutron activation of stable sodium in the body is commonly used to assess neutron doses after criticality accidents. However, the (24)Na distribution is not uniform owing to the interaction with the human body. In this study, we experimentally evaluated the (24)Na distribution in a PMMA water phantom and 60 polyethylene vials.
View Article and Find Full Text PDFGastric emptying, intestinal absorption of electrolytes and exercise performance in electrolyte-supplemented horses.
Exp Physiol
January 2013
Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Horses lose considerably more electrolytes through sweating during prolonged exercise than can be readily replaced through feeds. The present study tested an oral electrolyte supplement (ES) designed to replace sweat electrolyte losses. We measured gastric emptying of 3 litres of ES (using gamma imaging of (99)Tc-sulfide colloid), the absorption of Na(+) and K(+) from the gastrointestinal tract using (24)Na(+) and (42)K(+), and the distribution of these ions in the body by measuring radioactivity within plasma and sweat during exercise.
View Article and Find Full Text PDFEvaluation for activities of component of Cyclotron-Based Epithermal Neutron Source (C-BENS) and the surface of concrete wall in irradiation room.
Appl Radiat Isot
December 2011
Graduate School of Engineering, Kyoto University, Kyoto, Japan.
The workers employed in BNCT must enter the irradiation room just after an irradiation under the condition of remaining activities. To reduce the radiation exposure for the workers, it is important to identify the origins of the activities. In this research, the activities induced on the concrete wall surface were evaluated using MCNP-5 and the measurement results of thermal neutron distribution.
View Article and Find Full Text PDFMeasurement of thermal neutron fluence distribution with use of 23Na radioactivation around a medical compact cyclotron.
Radiol Phys Technol
July 2009
Department of Radiological Sciences, School of Health Sciences, Ibaraki Prefectural University, Inashiki-gun, Ibaraki, Japan.
A medical compact cyclotron produces about 10(15) neutrons per day along with 100 GBq of (18)F. Therefore, it is important to establish radiation safety guidelines on residual radioactivity for routine operation, maintenance work, and decommissioning. Thus, we developed a simple method for measuring the thermal neutrons in a cyclotron room.
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