Abstract
A method is described to estimate the counting efficiency appropriate to the body size of each individual subject in 137 Cs whole-body counting, using voxel phantoms. Individual voxel phantoms approximate to the body sizes of subjects were prepared by expanding and contracting the standard voxel phantom that corresponds to a Japanese standard adult male. The individual phantom was made to have the same body height and weight as those of each individual subject. For a whole-body counter at NIRS (Japan), the counting efficiencies for ten subjects were calculated, using the voxel phantoms and a Monte Carlo simulation code. The differences in the counting efficiency between each individual phantom and a conventional phantom ranged from -5 to +12%. The counting efficiency is larger in small body sizes than in large body sizes. The results indicate that body burdens tended to be overestimated in subjects of small body sizes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have