Application of the ML-EM algorithm in the suppression of Compton background of gamma-ray spectroscopy system

2015 ◽  
Vol 307 (3) ◽  
pp. 2137-2146
Author(s):  
Sy Minh Tuan Hoang ◽  
Gwang Min Sun ◽  
Hani Baek ◽  
Jiseok Kim
Keyword(s):  
Em Algorithm ◽  
Gamma Ray ◽  
Gamma Ray Spectroscopy ◽  
Spectroscopy System ◽  
Compton Background

Portable P-I-N CdZnte Gamma-Ray Spectroscopy System

1997 ◽  
Vol 487 ◽  
Author(s):  
R. Sudharsanan ◽  
C. Stenstrom ◽  
G. Vakerlis ◽  
J. Pantazis ◽  
A. Huber ◽  
...  
Keyword(s):  
Thermal Noise ◽  
Gamma Ray ◽  
Nuclear Materials ◽  
Sensitive Volume ◽  
Negative Effects ◽  
Leakage Currents ◽  
Battery Power ◽  
Detector Element ◽  
Gamma Ray Spectroscopy ◽  
Spectroscopy System

AbstractA portable Gamma-Ray Spectroscopy system has been designed and tested for identification of nuclear materials in the field. A P-I-N CdZnTe detector was developed to minimize the leakage current and to improve energy resolution. The detector has a sensitive volume of 200 mm3 and has been constructed with novel heterojunction contacts. Thermoelectric cooling is used to reduce leakage currents in the detector element and the input thermal noise to the FET. Risetime discrimination is used to offset the negative effects of incomplete charge collection. The detector probe is connected to a single unit comprised of detector electronics, an MCA and a portable computer, all operated from battery power. Results from testing with laboratory radioisotopic sources are presented.

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