Radiation detector, radiation measurement system and radiation measurement method

A radiation measurement method using a radiation detector which includes at least a scintillator, a main light guide, and a wavelength shift fiber, having first and second ends, for absorbing a scintillation light entering said main light guide from said scintillator to re-emit said absorbed scintillation light from both ends thereof, said method comprising:

• a signal processing step of converting said light leaving said first and second ends of said wavelength shift fiber of said radiation detector into first and second electric pulse signals, respectively;
• a pulse width setting step of setting said first and second electric pulse signals converted at said signal processing step to be two or more pairs of first and second pulse signals, said pairs each having different pulse widths;
• a coincidence processing step of carrying out a coincidence processing of each pair of said first and second pulse signals set at said pulse width setting step, to output a coincidence processed data corresponding to each pair of said first and second pulse signals, respectively;
• and
• a data processing step of calculating a radiation intensity based on said coincidence processed data and of making a correction in said radiation intensity on the basis of the relationship between said coincidence processed data in view of a temperature dependency of said scintillator of said radiation detector, when said radiation intensity is calculated.

A computer readable storage medium having stored a radiation measurement program for causing a computer to execute a procedure for measuring radiation using a radiation detector which includes at least a scintillator, a main light guide, and a wavelength shift fiber, having first and second ends, for absorbing a scintillation light entering said main light guide from said scintillator to re-emit said absorbed scintillation light from said first and second ends, said procedure comprising:

• a signal processing step of converting said light leaving said first and second ends of said wavelength shift fiber of said radiation detector into first and second electric pulse signals, respectively;
• a pulse width setting step of setting said first and second electric pulse signals converted at said signal processing step to be two or more pairs of first and second pulse signals, said pairs each having different pulse widths;
• a coincidence processing step of carrying out a coincidence processing of each pair of said first and second pulse signals set at said pulse width setting step, to output a coincidence processed data corresponding to each pair of said first and second pulse signals, respectively;
• and
• a data processing step of calculating a radiation intensity based on said coincidence processed data and of making a correction in said radiation intensity on the basis of the relationship between said coincidence processed data in view of a temperature dependency of said scintillator of said radiation detector, when said radiation intensity is calculated.