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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
08:34

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Shielding of relativistic protons.

A Bertucci1, M Durante, G Gialanella

  • 1Department of Biology, University Federico II, Monte S. Angelo, Via Cintia, 80126 Napoli, Italy.

Radiation and Environmental Biophysics
|January 27, 2007
PubMed
Summary

Shielding relativistic protons, abundant in deep space radiation, unexpectedly increased dose rates due to secondary protons. However, biological effectiveness remained unchanged, indicating effective radiation protection strategies are still feasible.

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Area of Science:

  • Space radiation physics
  • Radiation biology
  • Particle transport simulation

Background:

  • Relativistic protons are a primary component of galactic cosmic radiation, posing a significant risk to astronauts on long-duration space missions.
  • Effective shielding strategies are crucial for protecting crewmembers from the harmful effects of deep space radiation.
  • Understanding the interaction of protons with shielding materials is essential for developing accurate radiation protection measures.

Purpose of the Study:

  • To investigate the effects of shielding relativistic protons on radiation dose rates and biological effectiveness.
  • To characterize the secondary particle field generated by proton interactions with shielding materials.
  • To evaluate the biological impact of shielded radiation fields on human lymphocytes.

Main Methods:

  • Proton beams (up to 1 GeV) were directed at thick shielding materials (lucite/PMMA and aluminum/Al).
  • Dose rates were measured at various positions relative to the shielding.
  • Chromosomal aberrations in human lymphocytes were analyzed to assess biological effectiveness.
  • Simulations using the General-Purpose Particle and Heavy-Ion Transport code System (PHITS) were performed to model particle transport and dose distribution.

Main Results:

  • Shielding increased dose rates by 40-60% due to secondary proton production.
  • Dose rates decreased with increasing distance from the shield.
  • The fraction of aberrant cells in lymphocytes did not significantly change despite the increased dose per incident proton.
  • PHITS simulations indicated secondary protons had low Linear Energy Transfer (LET), explaining the unchanged biological effectiveness.

Conclusions:

  • While shielding relativistic protons increases dose rates, the biological effectiveness remains comparable to the direct beam.
  • The low LET of secondary protons suggests that current shielding approaches may still be viable for deep space radiation protection.
  • Further research into secondary particle generation and biological impact is warranted for optimizing astronaut safety.