一种用于β粒子计数的低噪声电流敏感型放大器-鉴别器系统。

A low-noise current-sensitive amplifier-discriminator system for beta particle counting.

作者信息

Sephton J P, Johansson L C, Williams J M

机构信息

National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.

出版信息

Appl Radiat Isot. 2008 Jun-Jul;66(6-7):890-4. doi: 10.1016/j.apradiso.2008.02.030. Epub 2008 Feb 12.

DOI:10.1016/j.apradiso.2008.02.030

PMID:18343136

Abstract

NPL has developed a low-noise current amplifier/discriminator system for radionuclides that emit low-energy electrons and X-rays. The new beta amplifier is based on the low-noise Amptek A-250 operational amplifier. The design has been configured for optimum signal to noise ratio. The new amplifier is described and results obtained using primarily electron-capture decaying radionuclides are presented. The new amplifier gives rise to higher particle detection efficiency than the previously used Atomic Energy of Canada Limited-designed amplifier. This is shown by measurements of (54)Mn and (65)Zn. The counting plateaux are significantly longer and have reduced gradients.

摘要

国家物理实验室（NPL）开发了一种用于发射低能电子和X射线的放射性核素的低噪声电流放大器/鉴别器系统。新型β放大器基于低噪声的安普泰克A - 250运算放大器。该设计已配置为实现最佳信噪比。本文描述了这种新型放大器，并给出了主要使用电子俘获衰变放射性核素所获得的结果。新型放大器比之前加拿大原子能有限公司设计的放大器具有更高的粒子探测效率。这通过对（54）锰和（65）锌的测量得到了证明。计数坪明显更长且梯度减小。