Implementation of a preamplifier-amplifier system for radiation detectors used in Mossbauer spectroscopy

被引:5
|
作者
Velasquez, A. A. [1 ]
Arroyave, M. [1 ]
机构
[1] Univ EAFIT, Grp Electromagnetismo Aplicado, Medellin 3300, Colombia
来源
HYPERFINE INTERACTIONS | 2014年 / 224卷 / 1-3期
关键词
Mossbauer spectroscopy; Preamplifier and amplifier system; Radiation detectors; CONSTRUCTION; DESIGN;
D O I
10.1007/s10751-013-0818-5
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
We report the assembly and testing of a preamplification and amplification system for pulses produced by gaseous radiation detectors commonly used in Mossbauer spectroscopy. The system is composed by a pair of commercial integrated circuits A203 and A206, which operate as charge sensitive preamplifier-shaping amplifier and linear amplifier-low level discriminator, respectively. The integrated circuits were interconnected in the unipolar output mode and placed inside a metallic shielding, which prevents noise amplification for a suitable signal-noise ratio. The system was tested by irradiating a proportional counter LND-45431 with characteristic X rays of 6.3 keV and gamma rays of 14.4 keV emitted by a Mossbauer radioactive source of Co-57 (Rh). Unipolar pulses with Gaussian profile were obtained at the output of the linear amplifier, whose amplitudes were close to 0.4 V for 6.3 keV X rays and 1.4 V for 14.4 keV gamma rays. Pulse height spectra showed that the system allows a satisfactory identification of the X-rays and gamma rays emitted by the Co-57 source, giving the possibility to make a good selection of the 14.4 keV peak for having a suitable signal-noise ratio in the Mossbauer spectra. Absorption percentages of 14 % were found by taking the Mossbauer spectra of a natural iron absorber. The assembly and tests of the system are presented through this paper.
引用
收藏
页码:65 / 72
页数:8
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