便携式α点测仪的研制  

A portable α detector

作　　者：陈明秀[1] 冷慧敏[1] 张明[1] 

机构地区：[1]中国工程物理研究院

出　　处：《核电子学与探测技术》2003年第6期580-582,共3页Nuclear Electronics & Detection Technology

摘　　要：为解决辐射场所不规则表面的污染监测,研制了便携式α点测仪。仪器由"点"式α探头、电测量仪表及信号传输电缆组成。采用屏蔽探头,屏蔽前置放大器和双屏蔽电缆传输等有效的抗干扰措施。在电源变换、放大及计数显示等电路中,又采取了相应的技术措施。研制成的仪器具有探测效率高(≥50%)、本底低(≤0.5min-1)、探头体积小(φ16mm×56mm)、功耗低、数字显示、携带方便等特点,已成功应用于不规则表面污染的测量。A portable device with small sensitive area for monitoring the contamination of irregular surface has been developed. The device is composed of α detector head, electronic measuring meter and signal trasmision cable. Some steps such as shielded detector head, shielded preamplifer and double shielded cable have been adopted to avoid the interference effect and corresponding technique has been introduced to the electric circuit for power changing, amplifying and count indication. This device is characteristic of high detective efficiency (>50%),low background (<0.5 cpm), small detector volume (φ16×56mm), low power cost and portable and so on.

关 键 词：便携式α点测仪 污染监测 放大器 放射性污染 探测器 

分 类 号：TL751[核科学技术—辐射防护及环境保护] TL816.2