C. Mori et al., RADIOACTIVITY DISTRIBUTION MEASUREMENT OF VARIOUS NATURAL MATERIAL-SURFACES WITH IMAGING PLATE, Journal of radioanalytical and nuclear chemistry, 206(2), 1996, pp. 263-267
Distribution images of natural radioactivity in natural materials such
as vegetables were obtained by using Imaging Plate. In such cases, it
is necessary to reduce background radiation intensity by one order or
more. Graded shielding is very important. Especially, the innermost s
urface of a shielding box should he covered with acrylic resin plate.
We obtained natural radioactivity distribution images of vegetables, s
ea food, meat etc. Mostly beta-rays emitted from K-40 print the radioa
ctivity distribution image. Comparison between gamma-ray intensity of
KCl solution measured with HPGe detector and that of natural material
specimen gave the radioactivity around 0.06 similar to 0.4 Bq/g depend
ing on the kind and the part of specimens.