Monte Carlo simulation of the γ-radiation dose field from fission products

Shang Peng; Niu Shengli; Zhu Jinhui; Liu Li; Zuo Yinghong

doi:10.11884/HPLPB202537.250220

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Article Navigation > High Power Laser and Particle Beams > 2025 > Accepted Manuscript

Shang Peng, Niu Shengli, Zhu Jinhui, et al. Monte Carlo simulation of the γ-radiation dose field from fission products[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250220

Citation:

Shang Peng, Niu Shengli, Zhu Jinhui, et al. Monte Carlo simulation of the γ-radiation dose field from fission products[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250220

Shang Peng, Niu Shengli, Zhu Jinhui, et al. Monte Carlo simulation of the γ-radiation dose field from fission products[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250220

Citation:

Shang Peng, Niu Shengli, Zhu Jinhui, et al. Monte Carlo simulation of the γ-radiation dose field from fission products[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250220

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Monte Carlo simulation of the γ-radiation dose field from fission products

doi: 10.11884/HPLPB202537.250220

Northwest Institute of Nuclear Technology, Xi'an 710024, China

Received Date: 2025-07-17
Accepted Date: 2025-09-01
Rev Recd Date: 2025-08-25

Available Online: 2025-09-13

Abstract

Abstract

Background
Extreme nuclear events typically generate intense explosions and release radioactive fission products. Fission product γ, emitted during radioactive decay of fission products, can affect radiation dose fields for 10⁻⁵ to 15 seconds. During this period, the source intensity, spectrum, and spatial distribution exhibit significant temporal variations. Concurrently, shock-waves induce complex atmospheric density changes, creating hydrodynamic enhancement effects.
Purpose
This study aims to develop a computational model for simulating time-varying fission product γ transport in non-uniform atmospheres perturbed by shock-waves, specifically quantifying the hydrodynamic enhancement effect on γ radiation dose fields.
Methods
A computational model for atmospheric density distribution was constructed using the LAMBR theory for shock-wave flow-field evolution. Based on radiation transport time-discrete theory, a transient variable-time-step Monte Carlo (MC) method was developed using the PHEN particle transport code.
Results
A validation via 20 kt TNT-equivalent detonation simulations at 400 m altitude was conducted to evaluate the hydrodynamic enhancement effect of fission product γ of ²³⁵U. The results demonstrate that, compared to a uniform atmospheric model, the hydrodynamic enhancement effect can amplify the γ dose by 2-3 times at some locations.
Conclusions
The proposed transient variable-time-step Monte Carlo simulation method can effectively capture the hydrodynamic enhancement effect of the shock wave-perturbed atmospheric density field on the fission product γ radiation fields.
- fission products,
- shock wave disturbance,
- Monte Carlo simulation,
- hydrodynamic enhancement effect

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References(37)

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