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Journal Articles

Recent progress in space weather research for cosmic radiation dosimetry

Sato, Tatsuhiko

Annals of the ICRP, 49(1_suppl.), p.185 - 192, 2020/12

The radiation environment in space is a complex mixture of particles of solar and galactic origin with a broad range of energies. For astronaut dose estimation, three sources must be considered, namely, galactic cosmic rays (GCR), trapped particles (TP), and solar energetic particles (SEP). More details about the radiation environment in space will be discussed at the symposium, together with the recent progresses on the space weather research for nowcasting and forecasting the astronaut doses due to SEP exposure.

Journal Articles

Evaluation of effective dose for exposures in the environment

Saito, Kimiaki

Annals of the ICRP, 49(2), p.7 - 9, 2020/10

no abstracts in English

Journal Articles

Operational quantities and new approach by ICRU

Endo, Akira

Annals of the ICRP, 45(1S), p.178 - 187, 2016/06

The protection quantities, equivalent dose in an organ or tissue and effective dose, were developed by ICRP to allow quantification of the extent of exposure of the human body to ionizing radiation to be used for the implementation of the limitation and optimization principles. The body-related protection quantities are not measurable in practice. Therefore, ICRU developed a set of operational dose quantities for use in radiation measurements for external radiations that provide assessment of the protection quantities. ICRU has examined the rationale for operational quantities taking into account the changes in the definitions of the protection quantities in the ICRP 2007 Recommendations. The committee has investigated a set of alternative definitions for operational quantities different to the existing quantities. The major change in the currently favoured set of quantities is the redefinition of the operational quantities for area monitoring from being based on doses at a point in the ICRU sphere to ones based on particle fluence and the relationship to the protection quantities.

Journal Articles

Radiation transport calculations for cosmic radiation

Endo, Akira; Sato, Tatsuhiko

Annals of the ICRP, 41(3-4), p.142 - 153, 2012/10

Radiation environment inside spacecrafts includes the primary radiation in space and secondary radiation produced by the interaction of the primary radiation with the equipment of the spacecrafts. Radiation fields inside astronauts are different from those outside them, because of the body-self shielding as well as the nuclear reactions occurring in the human body. Several computer codes have been developed to simulate the coupled transport of proton, heavy ions, and the secondary radiation produced in matter, and applied to space radiation protection: shielding design of spacecrafts, simulation of detector response, and analysis of organ doses in the human body. The presentation will focus on the methods and computer codes for radiation transport calculation of cosmic radiation, and their application to analysis of radiation fields inside spacecrafts, evaluation of organ doses and quality factors, and calculation of dose conversion coefficients using the ICRP reference phantoms.

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