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Radium deposition in human brain tissue: A Geant4-DNA Monte Carlo toolkit study.

S M J Mortazavi¹, Payman Rafiepour², S A R Mortazavi³

¹Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran.

Zeitschrift Fur Medizinische Physik

|February 29, 2024

Summary

This summary is machine-generated.

Exposure to alpha particles from radium-226 (²²⁶Ra) did not impact working memory but slowed reaction times. This finding is relevant for astronauts facing similar space radiation cognitive risks.

Keywords:

Alpha particles Monte Carlo simulation Radiation Radium Space exploration

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Area of Science:

Radiological Physics
Space Medicine
Neuroscience

Background:

NASA studies ²²⁶Ra in the brain to model astronaut exposure to high linear energy transfer (LET) alpha particles.
Radium-226 is a bone-seeker, leading to non-uniform radiation dose distribution in the brain, primarily near cranial bones.
High natural ²²⁶Ra levels in Ramsar, Iran, provide a unique human population for studying radiation exposure effects.

Purpose of the Study:

To investigate the cognitive effects of alpha particle exposure from ²²⁶Ra in Ramsar residents with a calcium-rich diet.
To assess the potential for improved dose uniformity in the cerebral and cerebellar parenchyma.
To evaluate a terrestrial model for simulating space radiation effects on the brain using Geant4.

Main Methods:

Prospective study on Ramsar residents.
Utilized the Geant4 Monte Carlo toolkit to simulate alpha particle and cosmic ray interactions.
Assessed cognitive functions, specifically working memory and reaction times.

Main Results:

²²⁶Ra exposure was not significantly associated with impaired working memory.
A significant association was found between ²²⁶Ra exposure and increased reaction times.
The study evaluated the validity of a terrestrial model for simulating space radiation environments.

Conclusions:

Alpha particle exposure from ²²⁶Ra may lead to cognitive impairments, specifically slowed reaction times, relevant to astronauts.
The findings highlight potential risks for astronauts on deep space missions due to high charge and energy particle exposure.
The Geant4 simulation provides a basis for validating terrestrial models of space radiation effects.