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Proceedings Paper

A high dynamic range current dosimeter for space ionization radiation measurement
Author(s): Sheng-jie Lei; Zhi-yong Wei
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Paper Abstract

A dosimeter for space ionization radiation field is developed, energy deposited in the sensitivity volume of ionization chamber induces an output current signal as weak as 10-14A, and the dynamic range of the signal is very high. Now, an ionization chamber is designed and a variable gain current feedback preamp module is designed for the weak output current amplification is connected to output of the ionization chamber anode. The amplifier module includes I-V converter with T shaped resistance net, zero correct circuit, low pass filter, voltage linear amplifier circuit, gain control circuit and voltage output circuit. A complete analysis of this current preamp with respect to its circuit structure, dynamic properties, its equivalent input noise and the temperature effect is given. The effects of stray impedances on the behavior of the current feedback preamp are taken into account and the techniques necessary to achieve an optimum stable electrometer, with respect to noise, Dc drift, leakage currents, are applied. Experiments show that the energy of dosimeter deposited in the sensitivity volume of ionization chamber induces an output current signal as weak as 10-14A, the current preamp can detect weak current effectively with the range from 100fA to 10μA through switchable gain.

Paper Details

Date Published: 16 August 2011
PDF: 8 pages
Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 819604 (16 August 2011); doi: 10.1117/12.895312
Show Author Affiliations
Sheng-jie Lei, Nanjing Univ. of Aeronautics and Astronautics (China)
Zhi-yong Wei, Nanjing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 8196:
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications
John C. Zarnecki; Carl A. Nardell; Rong Shu; Jianfeng Yang; Yunhua Zhang, Editor(s)

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