DocumentCode :
3611887
Title :
Characterization of Screen-Printed Mercuric Iodide Photoconductors for Mammography
Author :
Okla Joe ; Ho Kyung Kim ; Hanbean Youn ; Soohwa Kam ; Jong Chul Han ; Seungman Yun ; Seungryong Cho ; Cunningham, Ian A.
Author_Institution :
Sch. of Mech. Eng., Pusan Nat. Univ., Busan, South Korea
Volume :
62
Issue :
6
fYear :
2015
Firstpage :
3288
Lastpage :
3296
Abstract :
We describe energy-dependent incomplete signal generation in semiconductor detectors with a simple planar geometry using deep charge trapping and depth-of-interaction models. Based on this formalism, we have characterized mercuric iodide ( HgI2) photoconductors by extracting performance parameters from x-ray-induced signals under mammographic imaging conditions. The HgI2 sample photoconductors were prepared using a simple screen-printing method. For an x-ray tube output from tungsten target and 30-kV setting, the quantum absorption efficiency of samples with a thickness of approximately 0.1 mm was measured to be ~ 70%. X-ray sensitivity was measured to be 0.4 nC cm - 2 mR - 1. Mobility-lifetime products for electrons and holes were measured as ~ 2 ×10 - 6 cm2 V - 1 and ~ 0.9 ×10 - 6 cm2 V - 1, respectively. Considering incomplete charge collection, the W-value (or w) was estimated to be ~ 27 eV. Since the characterization method described in this study is simple and does not require sophisticated equipment, it can be useful for the characterization of photoconductor materials.
Keywords :
biomedical materials; mammography; mercury compounds; photoconducting materials; semiconductor counters; HgI2; X-ray signals; X-ray tube; deep charge trapping; depth-of-interaction models; energy-dependent incomplete signal generation; mammographic imaging conditions; mammography; photoconductor materials; quantum absorption efficiency; screen-printed mercuric iodide photoconductors; screen-printing method; semiconductor detectors; simple planar geometry; Charge carrier processes; Photoconducting materals; Semiconductor detectors; Semiconductor device measurement; X-ray imaging; Charge-collection efficiency; W-value; mammography; mercuric iodide; mobility-lifetime product; photoconductor; sensitivity;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2015.2497313
Filename :
7348793
Link To Document :
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