scholarly journals Calibration of NaI (Tl) cylindrical detector using axially shifted radioactive cylindrical sources

2019 ◽  
Vol 34 (4) ◽  
pp. 353-360
Author(s):  
Mona Gouda
Keyword(s):  
Theoretical Approach ◽  
Path Length ◽  
Detector System ◽  
Gamma Photon ◽  
Peak Efficiency ◽  
Energy Peak ◽  
Full Energy Peak Efficiency ◽  
Transfer Method ◽  
Efficiency Transfer Method ◽  
Good Agreement

In this article, the full energy peak efficiency of NaI detector using non-axial cylindrical sources is calculated by using a new efficient theoretical approach. This approach depends on using the efficiency transfer method and analytical calculations of the average path length of a gamma photon inside the source to the detector system. Measured efficiencies made by using 152Eu aqueous radioactive cylindrical sources with volumes 25 ml and 400 ml. Comparing calculated efficiencies to the measured one showed good agreement enabling the validation of this approach.

Calculation of the full-energy peak efficiency of NaI(Tl) detector using the efficiency transfer method for large radioactive cylindrical sources

2016 ◽  
Vol 54 (4) ◽  
pp. 592-606
Author(s):  
Ahmed. M. El-Khatib ◽  
Mona. M. Gouda ◽  
Mohamed. S. Badawi ◽  
A. Hamzawy ◽  
Nancy. S. Hussien ◽  
...  
Keyword(s):  
Full Energy Peak ◽  
Peak Efficiency ◽  
Full Energy ◽  
Energy Peak ◽  
Full Energy Peak Efficiency ◽  
Transfer Method ◽  
Efficiency Transfer Method

scholarly journals An analytical calculation model of the full energy peak efficiency for cylindrical detectors used in assays of radioactive waste drums

2016 ◽  
Vol 19 (2) ◽  
pp. 71-80
Author(s):  
Chuong Dinh Huynh ◽  
Dan Tieu Luu ◽  
Nguyen Hoang Vo ◽  
Thanh Thien Tran ◽  
Tao Nhat Chau
Keyword(s):  
Radioactive Waste ◽  
Analytical Calculation ◽  
Calculation Model ◽  
Full Energy Peak ◽  
Peak Efficiency ◽  
Full Energy ◽  
Energy Peak ◽  
Full Energy Peak Efficiency ◽  
Transfer Method ◽  
Waste Drums

In this paper, we present an analytical calculation model of full energy peak efficiency for cylindrical detectors without collimator based on efficiency transfer method. A calculation program by Mathematica language is developed to apply to this model. The validity of the calculation model was checked by comparison with MCNP5 simulated efficiency values for measurements of point source in the waste drum containing matrix of rubber or concrete. The discrepancy between MCNP5 simulated and calculated efficiencies is smaller 11 %. This shows that the calculation model is reliable and can be applied to calculate the full energy peak efficiency for assays of radioactive waste drums. Besides, the calculated time by the this program is much faster than the simulation using MCNP5 program.

scholarly journals Efficiency calibration for HPGe detector by Monte Carlo efficiency transfer method

2019 ◽  
Vol 3 (1) ◽  
pp. 9-17
Author(s):  
Le Thi Ngoc Trang ◽  
Huynh Dinh Chuong ◽  
Tran Thien Thanh
Keyword(s):  
Monte Carlo ◽  
Hpge Detector ◽  
Cylindrical Sample ◽  
Gamma Energy ◽  
Energy Peak ◽  
Full Energy Peak Efficiency ◽  
Transfer Method ◽  
P Type ◽  
Efficiency Transfer Method ◽  
Detector Model

In this paper, the Monte Carlo efficiency transfer method was used to calibrate the full energy peak efficiency (FEPE) of a coaxial p-type HPGe detector. The gamma standard radioactive sources including 22Na, 54Mn, 57Co, 60Co, 65Zn, 109Cd,133Ba, 137Cs, 154Eu, 207Bi, 241Am were measured at different positions on-center of detector with the distance of 5, 10, 15, 20, 25 cm. Besides, a cylindrical sample containing standard mixed nuclides solution was also measured at surface of the detector. The experimental FEPE curves as function of gamma energy for these geometries were determined with the coincidence-summing corrections. A HPGe detector model based on the specifications of manufacturer was built to directly calculate the FEPE for the geometries by Monte Carlo simulations with MCNP6 code. However, these simulated FEPEs show a quite high discrepancy from experimental FEPEs. Then, the FEPEs were calculated by the efficiency transfer method with the efficiency curve for point source at distance of 25 cm as the reference data. A good agreement was obtained between the calculated results by the Monte Carlo efficiency transfer method and experimental results. The comparisons between experimental and calculated FEPE showed that the relative deviations were mostly within +/-4% in the energy range of 53-1770 keV.  

scholarly journals Progress in radionuclide characterisation in marine sediments using an underwater gamma-ray spectrometer in 2π geometry

2019 ◽  
Vol 21 ◽  
pp. 29
Author(s):  
E. G. Androulakaki ◽  
C. Tsabaris ◽  
M. Kokkoris ◽  
G. Eleftheriou ◽  
D. L. Patiris ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Detection System ◽  
Full Energy Peak ◽  
Gamma Ray Spectrometry ◽  
Peak Efficiency ◽  
Full Energy ◽  
Effective Manner ◽  
Energy Peak ◽  
Full Energy Peak Efficiency

The in-situ gamma-ray spectrometry is a well suited method for seabed mapping applications, since it provides rapid results in a cost effective manner. Moreover, the in-situ method is preferable to the commonly applied laboratory measurements, due to its beneficial characteristics. Therefore, the development of in-situ systems for seabed measurements continuously grows. However, an efficiency calibration of the detection system is necessary for obtaining quantitative results in the full spectral range. In the present work, an approach for calculating the full-energy peak efficiency of an underwater insitu spectrometer for measure- ments on the seabed is presented. The experimental work was performed at the coastal site of Vasilikos (Cyprus). The experimental full-energy peak efficiency of the in-situ was determined in the energy range 1400–2600 keV, by combining the in-situ and laboratory reference measurements. The experimental effi- ciency results were theoretically reproduced by means of Monte Carlo (MC) simulations, using the MCNP5 code.

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