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Proton radiobiology and uncertainties.

T C Yang1

  • 1NASA Johnson Space Center, Houston, TX 77058, USA.

Radiation Measurements
|September 7, 2001
PubMed
Summary

This review covers proton radiobiology, essential for estimating shielding needs for space travel. Protons act like gamma radiation but show increased biological effects at very low or extremely high energies.

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Area of Science:

  • Space science
  • Radiation biology
  • Radiobiology

Background:

  • Clinical applications of proton radiation therapy have generated extensive biological data.
  • Understanding proton radiobiology is crucial for astronaut safety during interplanetary missions.

Purpose of the Study:

  • To review the radiobiology of protons.
  • To contribute to estimating proton shielding requirements for human space exploration.

Main Methods:

  • Literature review of proton radiobiology studies.
  • Analysis of existing biological data on proton radiation effects.

Main Results:

  • Protons are generally low-LET radiation, similar in biological effect to gamma radiation.
  • Enhanced biological effectiveness observed for very low energy (<10 MeV) stopping protons.
  • Limited data suggests potential for enhanced effectiveness with extremely high energy (>0.5 GeV) protons.

Conclusions:

  • Proton radiobiology is complex, with energy-dependent variations in biological effectiveness.
  • Shielding requirements for space missions must account for these specific proton characteristics.
Keywords:
NASA Center JSCNASA Discipline Radiation Health

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