MODELING OF SENSITIVITY OF LITHIUM-CONTAINING CRYSTAL SCINTILLATORS TO THERMAL NEUTRONS
Journal: ANRI
№ 3
, 2024
Rubrics: SCIENTIFIC ARTICLE
Authors:
1.
ATOMTEX SPE
2.
Scientific Production Unitary Enterprise «ATOMTEX»
Russian Federation
Russian Federation
3.
Belarussian state university of informatics and radioelectronics
Russian Federation
Russian Federation
Type:
Article
Pages:
from 30
to 36
Status:
Published
Received:
13.09.2024
Accepted:
13.09.2024
Published:
13.09.2024
Subject area:
UDK 001.891.572 Исследования с применением теоретических моделей, гипотез
Language:
Russian
Keywords:
ionizing radiation, neutron detection, lithium-containing scintillators, sensitivity, thermal neutrons, CLYC, CLLB, NaIL, FLUKA
Abstract (English):
This paper presents the results of Monte Carlo modelling of the sensitivity of the lithium containing detectors CLYC, NaIL, CLLB to thermal neutrons. The difference between the sensitivity and the neutron freepath depth of the CLYC scintillator enriched and unenriched with the 6Li isotope is shown. The analysis of the distribution of alpha particles and neutrons in the scintillator volume is performed, showing the inefficiency of the unenriched scintillator due to the fact that not all neutrons react with the crystal material. Mathematical modelling by the Monte Carlo method of the scintillator sensitivity and its comparison with respect to the irradiation direction has been carried out. It is shown that for the scintillator in the face and side geometry with the size more than 38 mm the difference in sensitivity at change of the neutron flux direction is connected only with the scintillator cross section and 6Li concentration with the same value of the specific sensitivity. The obtained model results were compared with available experimental data for NaIL and CLLB scintillators, which showed the reliability of the developed models and calculation methods.
This paper presents the results of Monte Carlo modelling of the sensitivity of the lithium containing detectors CLYC, NaIL, CLLB to thermal neutrons. The difference between the sensitivity and the neutron freepath depth of the CLYC scintillator enriched and unenriched with the 6Li isotope is shown. The analysis of the distribution of alpha particles and neutrons in the scintillator volume is performed, showing the inefficiency of the unenriched scintillator due to the fact that not all neutrons react with the crystal material. Mathematical modelling by the Monte Carlo method of the scintillator sensitivity and its comparison with respect to the irradiation direction has been carried out. It is shown that for the scintillator in the face and side geometry with the size more than 38 mm the difference in sensitivity at change of the neutron flux direction is connected only with the scintillator cross section and 6Li concentration with the same value of the specific sensitivity. The obtained model results were compared with available experimental data for NaIL and CLLB scintillators, which showed the reliability of the developed models and calculation methods.
Keywords:
ionizing radiation, neutron detection, lithium-containing scintillators, sensitivity, thermal neutrons, CLYC, CLLB, NaIL, FLUKA
ionizing radiation, neutron detection, lithium-containing scintillators, sensitivity, thermal neutrons, CLYC, CLLB, NaIL, FLUKA
1. R.G. Downing, G.P. Lamaze, J.K. Langland, S.T. Hwang, «Neutron depth profiling: Overview and description of NIST facilities», Journal of Research of the National Institute of Standards and Technology, vol. 98, no. 1, rp. 109, 1993.
2. NaIL Dual Detection Neutron-Gamma Scintillator. URL: https://www.luxiumsolutions.com/ radiation-detection-scintillators/crystal-scintillators/nail-scintillation-crystals (accessed Mar. 27, 2024).
