γ探测死时间与计数修正因子的关系

Relationship between γ Detection Dead-time and Count Correction Factor

摘要: 为在γ放射性活度很大的测量中使测量系统得到更好的准确度，本文使用干扰源研究HPGe探测器得到了测量系统死时间与计数损失的关系。在γ能量为0.3～1.3 MeV时进行实验，使用10⁴～10⁵ Bq量级的放射源，修正能峰的计数率一般保持在几十s^-1，证明在误差范围（3%）内，计数损失随死时间变化的关系与射线能量和计数强度无关，任意强度的任意核素均可使用这一修正公式进行计数损失修正。

Abstract: The relationship between dead-time and count correction factor was investigated by using interference source for purpose of high γ activity measurement. The count rates maintain serval 10 s^-1 with γ energy of 0.3-1.3 MeV for 10⁴-10⁵ Bq radioactive source. It is proved that the relationship between count loss and dead-time is unconcerned at various energy and various count intensities. The same correction formula can be used for any nuclide measurement.