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Evaluation of characteristics of the peak-to-valley ratio versus material thickness in transmission gamma spectra by Monte Carlo simulation

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Abstract

In this work, the variation of peak to valley (PTV) ratios was estimated and compared with the variation of full energy peak area counts (peak ROIs) versus thicknesses of alluminium and copper absorbed layers using Monte Carlo method with MCNP6 code. The experiment and simulation setup included a gamma spectrometer with NaI(Tl) detector, 137Cs gamma point source and absorbed layers of copper and alluminium. From the simulated spectra for different thicknesses of absorbed layers, PTV ratio and peak ROIs were calculated and the spacial resolutions were estimated and compared with each other. The results showed that the slopes of relative PTV–thickness curve are 5.8 times and 2.2 times more than the corresponding slopes of relative peak ROI - thickness curves for Al plate and Cu plate respectively. Minimum detection limits of material thickness by using PTV method are 0.002 ÷ 0.028 mm for alluminium; 0.005 ÷ 0.147 mm for copper which are more effectively than using peak ROI method (0.05 ÷ 0.14 mm for alluminium; 0.06 ÷ 1.90 mm for copper) in range of the material thickness from 0 to 3.5 mm.

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Acknowledgements

This work was done at the Nuclear Technique Laboratory (NTLab), VNUHCM—University of Science which was invested by Vietnam National University Ho Chi Minh City, Vietnam.

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Authors and Affiliations

  1. Nuclear Technique Laboratory, VNUHCM University of Science, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam

    Vu Ngoc Ba & Truong Thi Hong Loan

  2. Faculty of Physics and Engineering Physics, VNUHCM University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam

    Truong Thi Hong Loan

  3. Center for Nuclear Techniques, 217 Nguyen Trai Street, District 1, Ho Chi Minh City, Vietnam

    Ngo Quang Huy

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  1. Vu Ngoc Ba
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  2. Truong Thi Hong Loan
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  3. Ngo Quang Huy
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Correspondence to Truong Thi Hong Loan.

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Ba, V.N., Loan, T.T.H. & Huy, N.Q. Evaluation of characteristics of the peak-to-valley ratio versus material thickness in transmission gamma spectra by Monte Carlo simulation. J Radioanal Nucl Chem 317, 1455–1461 (2018). https://doi.org/10.1007/s10967-018-6035-6

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  • DOI: https://doi.org/10.1007/s10967-018-6035-6

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