Murawski Ł, Zielczyński M, Golnik N, Gryziński M A
National Centre for Nuclear Research, Sołtana 7, Otwock 05-400, Poland.
Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, Św. A. Boboli 8, Warsaw 02-525, Poland
Radiat Prot Dosimetry. 2014 Oct;161(1-4):130-3. doi: 10.1093/rpd/nct323. Epub 2013 Dec 8.
A micro-gap air-filled ionisation chamber was designed for criticality dosimetry. The special feature of the chamber is its very small gap between electrodes of only 0.3 mm. This prevents ion recombination at high dose rates and minimises the influence of gas on secondary particles spectrum. The electrodes are made of polypropylene because of higher content of hydrogen in this material, when compared with soft tissue. The difference between neutron and gamma sensitivity in such chamber becomes practically negligible. The chamber's envelope contains two specially connected capacitors, one for polarising the electrodes and the other for collecting the ionisation charge.
一种用于临界剂量测定的微间隙充气电离室被设计出来。该电离室的特点是其电极之间的间隙非常小，仅为0.3毫米。这可防止在高剂量率下离子复合，并将气体对次级粒子能谱的影响降至最低。电极由聚丙烯制成，因为与软组织相比，这种材料中的氢含量更高。在这种电离室中，中子和伽马灵敏度之间的差异实际上可以忽略不计。电离室的外壳包含两个特殊连接的电容器，一个用于使电极极化，另一个用于收集电离电荷。
