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Updated: Jul 25, 2025
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Published on: August 29, 2019
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An alternative method for calculation of half-value layers without the knowledge of attenuation coefficient
Mehdi Hassanpour1, Marzieh Hassanpour1, Mayeen Uddin Khandaker2
1Space Science Centre (ANGKASA), Institute of Climate Change (IPI), Universiti Kebangsaan Malaysia, Malaysia.
Summary
This study introduces a Monte Carlo simulation method to directly calculate the half-value layer (HVL) for gamma ray shielding, bypassing traditional linear attenuation coefficient calculations. The findings suggest considering specific parameters to improve HVL calculation accuracy in radiation protection.
Area of Science:
- Nuclear Physics
- Radiation Physics
- Health Physics
Background:
- Radiation protection is essential for safe ionizing radiation use.
- Accurate calculation of shielding parameters like half-value layer (HVL) is critical.
- Traditional HVL calculation relies on the linear attenuation coefficient (μ).
Purpose of the Study:
- To directly calculate the half-value layer (HVL) using Monte Carlo simulation.
- To bypass the need for pre-determined linear attenuation coefficients (μ).
- To optimize simulation parameters for reduced measurement error in HVL calculations.
Main Methods:
- Utilized the Monte Carlo N-Particle eXtended (MCNPX) code for simulation.
- Defined F1, F5, and Mesh Popul sequences tallies within MCNPX.
- Investigated the impact of R parameter and radiation angle on calculation accuracy.
Main Results:
- MCNPX simulation results for HVL showed good agreement with experimental data.
- Identified R parameter and radiation angle as crucial for reducing HVL calculation errors.
- Demonstrated that considering measurement errors (6-20%) allows MCNPX code output to be applicable across various energy ranges.
Conclusions:
- Direct HVL calculation via Monte Carlo simulation is a viable alternative.
- Optimizing R parameter and radiation angle enhances HVL calculation precision.
- The proposed method offers improved accuracy for radiation shielding assessments.
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