3DHZETRN: Shielded ICRU spherical phantom.

Area of Science:

• Space radiation physics
• Computational physics
• Nuclear engineering

Background:

• Accurate simulation of High Charge and Energy (HZE) particle and light ion transport is crucial for space radiation shielding.
• Previous models, like the straight-ahead approximation, have limitations in complex geometries and inhomogeneous media.
• A computationally efficient 3D code was developed for homogeneous shields, showing promise for improved accuracy.

Purpose of the Study:

• To extend the computationally efficient 3DHZETRN code to simulate particle transport in inhomogeneous media.
• To verify the accuracy of the new algorithms using Monte Carlo simulations.
• To assess the performance of 3D corrections compared to the straight-ahead approximation for space-like conditions.

Main Methods:

• Development and implementation of new algorithms with convergence criteria for the 3DHZETRN code.
• Extension of the code to handle inhomogeneous media, specifically shielded tissue slabs and spheres.
• Verification of the code's solutions against established Monte Carlo simulation benchmarks.

Main Results:

• The extended 3DHZETRN code accurately simulates neutron and light ion propagation in inhomogeneous shielded media.
• 3D corrections significantly improve the accuracy of fluence spectra compared to the straight-ahead approximation.
• The new algorithms demonstrate well-defined convergence, ensuring reliable simulation results.

Conclusions:

• The computationally efficient 3DHZETRN code, extended for inhomogeneous media, provides accurate simulations of space radiation transport.
• These methods offer a robust foundation for developing software for space shield design and optimization.
• The improved accuracy of 3D corrections is vital for enhancing crew and equipment safety in space.