A Modified Method for Correcting Instrumental Spectrum of High Hurity Germanium Detector

ANRI ◽  
2020 ◽  
Vol 0 (4) ◽  
pp. 14-28
Author(s):  
Aliaksei Zaharadniuk ◽  
Roman Lukashevich ◽  
Konstantin Syankovsky ◽  
Aleksandr Novichenko
Keyword(s):  
Hpge Detector ◽  
Germanium Detector ◽  
Smooth Curve ◽  
Detector Response ◽  
Response Matrix ◽  
Modified Method ◽  
High Purity Germanium ◽  
The Monte Carlo Method ◽  
True Shape ◽  
Corrected Spectrum

The paper considers an improved method for correcting the instrumental spectrum of a high purity germanium detector (HPGe detector) in the energy range (10–300 keV). The method uses a detector response matrix obtained by the Monte Carlo method, which allows to bring the appearance of the instrumental spectrum of the HPGe detector closer to its true shape by minimizing the influence of the detector response function. The main difference of this method from analogs is the additional deconvolution algorithm of the corrected spectrum, which makes it possible to obtain a smooth curve at the output.

Monte Carlo simulation of gamma-ray interactions in an over-square high-purity germanium detector for in-vivo measurements

2016 ◽  
Vol 44 ◽  
pp. 1660225
Author(s):  
Mirela Angela Saizu
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
High Purity ◽  
Hpge Detector ◽  
Germanium Detector ◽  
Efficiency Calibration ◽  
Gamma Energy ◽  
High Purity Germanium ◽  
The Monte Carlo Method

The developments of high-purity germanium detectors match very well the requirements of the in-vivo human body measurements regarding the gamma energy ranges of the radionuclides intended to be measured, the shape of the extended radioactive sources, and the measurement geometries. The Whole Body Counter (WBC) from IFIN-HH is based on an “over-square” high-purity germanium detector (HPGe) to perform accurate measurements of the incorporated radionuclides emitting X and gamma rays in the energy range of 10 keV–1500 keV, under conditions of good shielding, suitable collimation, and calibration. As an alternative to the experimental efficiency calibration method consisting of using reference calibration sources with gamma energy lines that cover all the considered energy range, it is proposed to use the Monte Carlo method for the efficiency calibration of the WBC using the radiation transport code MCNP5. The HPGe detector was modelled and the gamma energy lines of [Formula: see text]Am, [Formula: see text]Co, [Formula: see text]Ba, [Formula: see text]Cs, [Formula: see text]Co, and [Formula: see text]Eu were simulated in order to obtain the virtual efficiency calibration curve of the WBC. The Monte Carlo method was validated by comparing the simulated results with the experimental measurements using point-like sources. For their optimum matching, the impact of the variation of the front dead layer thickness and of the detector photon absorbing layers materials on the HPGe detector efficiency was studied, and the detector’s model was refined. In order to perform the WBC efficiency calibration for realistic people monitoring, more numerical calculations were generated simulating extended sources of specific shape according to the standard man characteristics.

scholarly journals Integration of the differential evolution algorithm and the Monte Carlo code to create a spectrometric detector model

2022 ◽  
Vol 2155 (1) ◽  
pp. 012020
Author(s):  
I V Prozorova
Keyword(s):  
Monte Carlo ◽  
Standard Procedure ◽  
Differential Evolution Algorithm ◽  
Germanium Detector ◽  
Cost Effective ◽  
Monte Carlo Code ◽  
High Purity Germanium ◽  
The Monte Carlo Method ◽  
Evolution Algorithm ◽  
Detector Model

Abstract A standard procedure for characterizing the high-purity germanium detector (HPGe), manufactured by Canberra Industries Inc [1], is performed directly by the company using patented methods. However, the procedure is usually expensive and must be repeated because the characteristics of the HPGe crystal change over time. In this work, the principles of a technique are developed for use in obtaining and optimizing the detector characteristics based on a cost-effective procedure in a standard research laboratory. The technique requires that the detector geometric parameters are determined with maximum accuracy by the Monte Carlo method [2] in parallel with the optimization based on evolutionary algorithms. The development of this approach facilitates modeling of the HPGe detector as a standardized procedure. The results will be also beneficial in the development of gamma spectrometers and/or their calibrations before routine measurements.

scholarly journals Determination of 137Cs in Sea Water Samples Using Gamma Spectrometry

2020 ◽  
Vol 13 ◽  
pp. 247
Author(s):  
N. Evaggeliou ◽  
Ch. Lykomitrou ◽  
A. Zafiropoulou
Keyword(s):  
Gamma Spectrometry ◽  
Comparative Evaluation ◽  
Sea Water ◽  
Germanium Detector ◽  
Advantages And Disadvantages ◽  
High Purity Germanium ◽  
Co Precipitation ◽  
Radioanalytical Procedures

In the present study a comparative evaluation of two methods for 137Cs determination (pretreatment for gamma spectrometry) is attempted. One of them is the conventional AMP (ammonium molybdophosphate, (ΝΗ4)3Ρ(Μo3O10)4) method (radiochemical treatment based on coprecipitation) and the other one is a method based on pre-concentration of cesium in situ by using the Mark III Centrifugal Pump. The pump, which is described analytically in the study, is composed of a mo­tor (pump), four cartridge housings (containing the scavengers), a flow meter and a pressure tube (containing the battery pack and the timer board). For justification, this method is compared with the AMP co-precipitation one. Following up the radioanalytical procedures, the gamma spectrometry system (relative efficiency of high purity germanium detector 90%) is also demonstrated, as conformed to mea­ suring obtained parameters. Finally, the advantages and disadvantages of these two methods are recorded and the application of each one is suggested.

A prototype high-purity germanium detector system with fast photon-counting circuitry for medical imaging

1991 ◽  
Vol 18 (5) ◽  
pp. 900-909 ◽  
Author(s):  
Bruce H. Hasegawa ◽  
Benno Stebler ◽  
Brian K. Rutt ◽  
Alberto Martinez ◽  
Eric L. Gingold ◽  
...  
Keyword(s):  
Medical Imaging ◽  
High Purity ◽  
Photon Counting ◽  
Germanium Detector ◽  
Detector System ◽  
High Purity Germanium Detector ◽  
High Purity Germanium
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