Zhang Zizhu, Chong Yizheng, Chen Xinru, Jin Congjun, Yang Lijun, Liu Tong
China Nuclear Industry Beijing 401 Hospital, Beijing 102413, China.
China Zhongyuan Engineering Corporation, Beijing 100083, China.
Appl Radiat Isot. 2015 Dec;106:161-5. doi: 10.1016/j.apradiso.2015.07.049. Epub 2015 Jul 29.
A prompt gamma neutron activation analysis (PGNAA) system has been recently developed at the 30-kW research reactor In-Hospital Neutron Irradiator (IHNI) in Beijing. Neutrons from the specially designed thermal neutron beam were used. The thermal flux of this beam is 3.08×10(6) cm(-2) s(-1) at a full reactor power of 30 kW. The PGNAA system consists of an n-type high-purity germanium (HPGe) detector of 40% efficiency, a digital spectrometer, and a shielding part. For both the detector shielding part and the neutron beam shielding part, the inner layer is composed of (6)Li2CO3 powder and the outer layer lead. The boron-10 sensitivity of the PGNAA system is approximately 2.5 cps/ppm. Two calibration curves were produced for the 1-10 ppm and 10-50 ppm samples. The measurement results of the control samples were in accordance with the inductively coupled plasma atomic emission spectroscopy (ICP-AES) results.
最近，在北京30千瓦的医院中子辐照器（IHNI）研究堆上开发了一种瞬发伽马中子活化分析（PGNAA）系统。使用了来自专门设计的热中子束的中子。在30千瓦的全堆功率下，该束的热通量为3.08×10(6)厘米(-2)秒(-1)。PGNAA系统由一个效率为40%的n型高纯锗（HPGe）探测器、一个数字光谱仪和一个屏蔽部件组成。对于探测器屏蔽部件和中子束屏蔽部件，内层由(6)Li2CO3粉末组成，外层为铅。PGNAA系统的硼-10灵敏度约为2.5 cps/ppm。针对1-10 ppm和10-50 ppm的样品绘制了两条校准曲线。对照样品的测量结果与电感耦合等离子体原子发射光谱（ICP-AES）结果一致。
