A magnetically levitated electrode ionization chamber of the noncontact measurement type
A magnetically levitated electrode ionization chamber of the noncontact measurement type
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非接触测量型磁悬浮电极电离室
DOI：
10.1016/s0168-9002(01)01346-8
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Yoshimura
中科院分区：
文献类型：
--
作者：
T. Kawaguchi;A. Yoshimura
研制了一种新型悬浮电极电离室。在这种电离室中，离子收集电极悬浮在空气中，而没有得到绝缘体的任何物理支撑。电极通过静电充电器充电而没有物理接触。电极的电荷在法拉第笼中以给定的时间间隔周期性地读出，而没有物理接触。由于其电极悬浮，电离室不会产生由泄漏或压电电流引起的背景电流。此外，由于其电极的充电和其电荷的读出是在没有物理接触的情况下进行的，因此不会发生由于电极和接触点之间的颤动而引起的不规则电荷或接触电势差。通过实验发现，该电离室能够以较高的灵敏度测量环境辐射等γ射线剂量。累积1 h时，电离电流的最小可探测值约为1.3×10− 17 A。
A new type of ionization chamber with levitated electrode has been developed. In this ionization chamber, an ion-collection electrode levitates in the air without getting any physical support from the insulator. The electrode is charged by an electrostatic charger without physical contact. The charge of the electrode is read out at a Faraday cage periodically at a given time interval without physical contact. Because its electrode levitates, the ionization chamber produces no background current caused by leaks or piezo current. In addition, as the charging of its electrode and the read-out of its charge are carried out without physical contact, no irregular charge or contact potential difference due to the chattering between electrode and contact point occurs. Through experiments, it was found that this ionization chamber was able to measure the γ-ray dose such as the environmental radiation with a high degree of sensitivity. The minimum detectable value of ionization current when accumulated for 1 h is about 1.3×10−17A .