物理学报2012，Vol.61Issue(8)：127-134,8.
用于反应堆中子/γ射线混合场测量的涂硼电离室性能
Performances of a boron-lined ionization chamber used in neutron/y-ray mixed field of reactors
摘要
Abstract
Boron-lined ionization chambers （BLICs） have gradually become one of radiation detectors which are used to monitor the neutron/y-ray mixed field with large flux around reactors in recent years. In this paper a BLIC with high sensitivity is fabricated and the internal structure is detailed. By using a weak current amplifier with an accuracy of fA, the leakage current of the BLIC is less than 1.0 pA when the high voltage is below 700 V; under the irradiation by the Am-Be neutron source, on the I-V curve of the BLIC there appears a current plateau with a length of 500 V and a slope of 3.72 x 10- 4 V- 1; when the operating voltage is 400 V, the leakage current of the BLIC is 0.4 pA. Experiments show that neutron signal current measured by the BLIC depends on the relative position of the BLIC with repect to the radiation source; a maximum of 2.0 pA is obtained when the source is 8 cm away from the bottom of the hole in the paraffin moderator. Under the exposure by 137Cs and 9~Sr, T-ray signal current measured by the BLIC is 1.0--2.0 pA, but the current plateau is not obvious in T-ray field. The neutron sensitivity of the BLIC reaches a level of 1.0x 10-15 Acm2s and the T-ray sensitivity reaches a level of 9.0x 10-22 Acm2s.eV-1. The BLIC shows small leakage current, high sensitivity, and good plateau characteristics, which can be used to monitor the neutron/T-ray mixed field around reactors.关键词
涂硼电离室/漏电流/坪特性/灵敏度Key words
boron-lined ionization chambers/leakage current/plateau feature/sensitivity分类
数理科学引用本文复制引用
陈国云,辛勇,黄福成,魏志勇,雷升杰,黄三玻,朱立,赵经武,马加一..用于反应堆中子/γ射线混合场测量的涂硼电离室性能[J].物理学报,2012,61(8):127-134,8.基金项目
国家自然科学基金（批准号：41064002）资助的课题. （）
