RADIATION DETECTOR, AND METHOD OF DETECTING RADIATION

摘要

There is provided a radiation detector and a method of detecting radiation capable of more accurately correct fluorescence pileup. A table T in which the peak value h and the time course Tc of the intensity of fluorescence are related is previously prepared before radiation detection. The table T is based on actually-measured variation with time of the fluorescence intensity, and therefore faithfully represents the variation with time of fluorescence. When the occurrence of pileup is determined, the time course Tc corresponding to the peak value h immediately before the occurrence of the pileup is read out, and the time course Tc is subtracted from variation with time of the intensity data D to thereby estimate variation with time of the intensity of fluorescence after the occurrence of the pileup.

主权项

1. A radiation detector comprising:
a scintillator configured to convert radiation into fluorescence; a photodetector configured to detect the fluorescence; storage means for storing therein a table in which a peak value, which is a maximum value of intensity of the fluorescence in a series of processes from emission of the fluorescence generated by the radiation entered the scintillator to attenuation of the fluorescence, and a time course of the intensity of the fluorescence are related; intensity data monitor means for generating intensity data indicating the intensity of the fluorescence on a basis of an output from the photodetector, and monitoring the intensity data with time; peak value acquisition means for acquiring the peak value on the basis of the intensity data output from the intensity data monitor means; pileup occurrence determination means for determining, on a basis of variation with time of the intensity data, occurrence of pileup which is a phenomenon in which, while the fluorescence generated by the radiation that has entered the scintillator is being attenuated, radiation again enters the scintillator, and the intensity of the fluorescence that has been continuously attenuated again increases; and estimation means for reading out the time course corresponding to the peak value immediately before occurrence of pileup, the peak value being acquired by the peak value acquisition means, from the storage means when the occurrence of the pileup is determined and subtracting the time course from the variation with time of the intensity data output from the intensity data monitor means to estimate variation with time of the intensity of the fluorescence after the occurrence of the pileup.