Purpose PGNAA is a well-known method for analyzing the composition of rock samples. In this work, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\text {LaBr}_{3}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>LaBr</mtext> <mn>3</mn> </msub> </math></EquationSource> </InlineEquation> is used as a gamma detector. For correct operation of the elemental analysis, it is necessary to calibrate by the registration efficiency of the available method over a wide range of energies from 50 keV to 15 MeV. Traditionally, such calibration requires a particle accelerator or reactor in this work, a practical, alternative is proposed. Method A combination of standard gamma-ray sources, thermal neutron capture reactions on <InlineEquation ID="IEq5"> <EquationSource Format="TEX">$^{35}\text {Cl (n,}\gamma \text {)}^{36}\text {Cl}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mmultiscripts> <mrow /> <mrow /> <mn>35</mn> </mmultiscripts> <mtext>Cl (n,</mtext> <mi>γ</mi> <msup> <mtext>)</mtext> <mn>36</mn> </msup> <mtext>Cl</mtext> </mrow> </math></EquationSource> </InlineEquation> using a DT neutron generator, and simulations in Geant4 was employed to determine the full-energy peak efficiency of the <InlineEquation ID="IEq6"> <EquationSource Format="TEX">$\text {LaBr}_{3}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>LaBr</mtext> <mn>3</mn> </msub> </math></EquationSource> </InlineEquation> detector. This approach fully compensates for the absence of a reactor while still providing a wide energy range. Results and conclusion The full-energy peak efficiency of detector <InlineEquation ID="IEq7"> <EquationSource Format="TEX">$\text {LaBr}_{3}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>LaBr</mtext> <mn>3</mn> </msub> </math></EquationSource> </InlineEquation>(Ce) with dimensions Ø7.6<InlineEquation ID="IEq8"> <EquationSource Format="TEX">$\times $</EquationSource> <EquationSource Format="MATHML"><math> <mo>×</mo> </math></EquationSource> </InlineEquation>7.6 cm was determined in energy region from 50 keV to 15 MeV. The results show that the experiments are in good agreement with the simulation in Geant4, and the full-energy peak efficiency curves are consistent. Thus, a practical solution for wide-energy calibration in PGNAA applications is offered.

Efficiency calibration of $\text {LaBr}_{3}$: Ce detector in wide energy region

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发表日期：

2026年7月23日

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Ivan Levtsov,
Oleg Chakilev,
Svyatoslav Kolesnikov

摘要

Purpose

PGNAA is a well-known method for analyzing the composition of rock samples. In this work, $\text {LaBr}_{3}$ ${LaBr}_{3}$ is used as a gamma detector. For correct operation of the elemental analysis, it is necessary to calibrate by the registration efficiency of the available method over a wide range of energies from 50 keV to 15 MeV. Traditionally, such calibration requires a particle accelerator or reactor in this work, a practical, alternative is proposed.

Method

A combination of standard gamma-ray sources, thermal neutron capture reactions on $^{35}\text {Cl (n,}\gamma \text {)}^{36}\text {Cl}$ $^{35} Cl (n, γ)^{36} Cl$ using a DT neutron generator, and simulations in Geant4 was employed to determine the full-energy peak efficiency of the $\text {LaBr}_{3}$ ${LaBr}_{3}$ detector. This approach fully compensates for the absence of a reactor while still providing a wide energy range.

Results and conclusion

The full-energy peak efficiency of detector $\text {LaBr}_{3}$ ${LaBr}_{3}$ (Ce) with dimensions Ø7.6 $\times $ $\times$ 7.6 cm was determined in energy region from 50 keV to 15 MeV. The results show that the experiments are in good agreement with the simulation in Geant4, and the full-energy peak efficiency curves are consistent. Thus, a practical solution for wide-energy calibration in PGNAA applications is offered.

Efficiency calibration of \(\text {LaBr}_{3}\): Ce detector in wide energy region

摘要