Fluence-based and microdosimetric event-based methods for radiation protection in space

Area of Science:

• Space radiation physics
• Radiation protection science
• Dosimetry

Background:

• Space travel poses significant radiation exposure risks to astronauts.
• Accurate measurement of the space radiation environment is crucial for estimating health risks.
• The National Council on Radiation Protection and Measurements (NCRP) Report #137 addresses these challenges.

Purpose of the Study:

• To evaluate novel dosimetry methodologies for space radiation.
• To compare these with conventional methods for radiation risk assessment.
• To discuss challenges in measuring radiation dose equivalents in spacecraft.

Main Methods:

• Evaluation of fluence-based dosimetry.
• Assessment of microdosimetric event-based dosimetry.
• Comparison with the conventional quality factor/Linear Energy Transfer (LET) method.

Main Results:

• The conventional quality factor/LET method remains compelling for current space radiation protection.
• Novel methods show potential but are not yet superior.
• Challenges exist in measuring equivalent dose and organ dose equivalent.

Conclusions:

• No immediate need to switch from the conventional dosimetry method.
• Alternative methods (fluence-based, microdosimetric) should be considered for future development.
• Revisiting dosimetry techniques as data and technology advance is recommended for improved space radiation risk assessment.