A novel method for calculating number buildup factor in gamma-ray transmission measurements using narrow beam geometry
In this article, we present a novel method to calculate the number buildup factor for arbitrary materials in gamma-ray transmission measurements using a narrow beam geometry. The MCNP6 code was used to simulate photon transport within a collimated transmission configuration, which included...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VINCA Institute of Nuclear Sciences
2024-01-01
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| Series: | Nuclear Technology and Radiation Protection |
| Subjects: | |
| Online Access: | https://doiserbia.nb.rs/img/doi/1451-3994/2024/1451-39942403185C.pdf |
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| Summary: | In this article, we present a novel method to calculate the number buildup
factor for arbitrary materials in gamma-ray transmission measurements using
a narrow beam geometry. The MCNP6 code was used to simulate photon transport
within a collimated transmission configuration, which included a NaI(Tl)
scintillation detector paired with a 137Cs or 60Co radioactive source.
From these simulations, the number buildup factor values were computed for
various materials at gamma-ray energies of 661.7 keV, 1173.2 keV, and 1332.5
keV, with sample thicknesses ranging from 0.1-7.0 cm. At each specific
gamma-ray energy and material, the number buildup factor values exhibited a
strong linear relationship with the sample thickness. Furthermore, the slope
of these linear relationships can be expressed as a product of mass density and a cubic polynomial function of the atomic number. Based on these
findings, we developed a fitting formula to calculate the number buildup
factor using the input variables of sample thickness, mass density, and
atomic number. The accuracy of the fitting formula was evaluated by
comparing its results with number buildup factor values computed by MCNP6
code. The comparison showed relative deviations below 1 % for all the
investigated cases, demonstrating the high accuracy and reliability of the
fitting formula. |
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| ISSN: | 1451-3994 1452-8185 |