公开(公告)号：US5574758A

公开(公告)日：1996-11-12

申请号：US371291

申请日：1995-01-11

申请人： Ryuji Murakami ,  Masataka Yamada ,  Hirofumi Shintani ,  Shingo Ando

发明人： Ryuji Murakami ,  Masataka Yamada ,  Hirofumi Shintani ,  Shingo Ando

IPC分类号： G01T1/167 ,  G01T1/17 ,  G01T1/172 ,  G01T1/36 ,  G01T7/00 ,  G21C17/02

CPC分类号： G01T1/172 ,  G01T1/36 ,  G01T7/00

摘要： A gamma-rays measurement method of radionucludes (iodine-131, cobalt-60, etc.) coexisting with radionuclides (nitrogen-13, fluorine-18, cobalt-58, etc.) each emitting a pair of annihilation gamma-rays, particularly in primary water of a nuclear reactor by the use of a gamma-ray spectrometric system which includes a primary detector for detecting the gamma-rays and the one annihilation gamma-rays as pulses, a secondary detector for detecting the other annihilation gamma-rays as pulses, and shield detector for detecting gamma-rays Compton-scattered and escaped from the primary to shield detectors as pulses. The method comprises counting the pulses of the secondary detector in anticoincidence with the pulses of the primary detector, thereby to reject the recording of the annihilation gamma-rays from the primary detector, thus minimizing the annihilation gamma-rays disturbing to the measurement, followed by determining count numbers of the gamma-rays. Detection limits of the gamma-rays can be elevated significantly thereby. Simultaneously, further anticoincidence counting of the shield detector with the primary detector can be conducted to diminish the Compton-scattered gamma-rays.

摘要翻译： 与放射性核素（氮-13，氟-18，钴-58等）共存的放射性核素（碘-131，钴-60等）的伽马射线测量方法，各自发射一对湮灭伽马射线，特别是 在核反应堆的初级水中，通过使用包括用于检测伽马射线和一个湮灭伽马射线作为脉冲的主检测器的伽马射线光谱系统，用于检测其它湮灭伽马射线的次级检测器 脉冲和屏蔽检测器，用于检测伽马射线康普顿散射并从主要部件逃逸到屏蔽检测器作为脉冲。 该方法包括对主检测器的脉冲进行反射计数二次检测器的脉冲，从而抑制来自主检测器的湮灭伽马射线的记录，从而最小化干扰测量的湮灭伽马射线，随后是 确定伽马射线的计数。 伽马射线的检测极限可以显着提高。 同时，可以进行具有主检测器的屏蔽检测器的进一步的防伪计数以减少康普顿散射的γ射线。