Analysis of MIR-18 results for physical and biological dosimetry: radiation shielding effectiveness in LEO
| Autor: | John F. Dicello, J.R Williams, John W. Wilson, Francis A. Cucinotta |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Linear energy transfer
Cosmic ray Radiation Models Biological Chromosome aberration Radiation Protection Optics Radiation Monitoring Relative biological effectiveness Humans Dosimetry Linear Energy Transfer Lymphocytes Instrumentation Chromosome Aberrations Physics Weightlessness Equivalent dose business.industry Dose-Response Relationship Radiation Space Flight Computational physics Protons Radiation protection business Cosmic Radiation Relative Biological Effectiveness |
| Zdroj: | Radiation Measurements. 32:181-191 |
| ISSN: | 1350-4487 |
| DOI: | 10.1016/s1350-4487(99)00273-5 |
| Popis: | We compare models of radiation transport and biological response to physical and biological dosimetry results from astronauts on the Mir space station. Transport models are shown to be in good agreement with physical measurements and indicate that the ratio of equivalent dose from the Galactic Cosmic Rays (GCR) to protons is about 3/2:1 and that this ratio will increase for exposures to internal organs. Two biological response models are used to compare to the Mir biodosimetry for chromosome aberration in lymphocyte cells; a track-structure model and the linear-quadratic model with linear energy transfer (LET) dependent weighting coefficients. These models are fit to in vitro data for aberration formation in human lymphocytes by photons and charged particles. Both models are found to be in reasonable agreement with data for aberrations in lymphocytes of Mir crew members: however there are differences between the use of LET dependent weighting factors and track structure models for assigning radiation quality factors. The major difference in the models is the increased effectiveness predicted by the track model for low charge and energy ions with LET near 10 keV/micrometers. The results of our calculations indicate that aluminum shielding, although providing important mitigation of the effects of trapped radiation, provides no protective effect from the galactic cosmic rays (GCR) in low-earth orbit (LEO) using either equivalent dose or the number of chromosome aberrations as a measure until about 100 g/cm 2 of material is used. |
| Databáze: | OpenAIRE |
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