To provide a radiation measurement apparatus that can accurately measure a radiation dose up to an upper limit of a wide measurement range with a simple configuration.
The radiation measurement apparatus comprises: a radiation detector for outputting an analog pulse signal of a wave height value dependent on energy of an incident radiation; counting rate measurement means for measuring a counting rate m by counting a number of analog pulse signals meeting a predetermined wave height condition; wave height spectrum measurement means for measuring a wave height spectrum of an analog pulse signal output from the radiation detector; radiation dose conversion means for determining a radiation dose d on basis of the measured wave height spectrum; and radiation dose correction means for correcting the radiation dose d on basis of the measured counting rate m. And when the counting rate without counting loss is n, and decomposition time is τ, the radiation dose correction means includes a correction table for n relative to m generated from m=n*exp(-nτ), and multiplies the radiation dose d by n/m of the correction table, to determine and output a corrected radiation dose d*n/m.
MOGI KENICHI
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Toshihide Kodama
Takenaka Ikuo
Keigo Murakami