Evaluation of dose rate reduction in a spacecraft compartment due to additional water shield

The dose reduction rates brought about by the installation of additional water shielding in a spacecraft are calculated in the paper using the particles and heavy ion transport code system PHITS, which can deal with transport of all kinds of hadrons and heavy ions with energies up to 100 GeV/n in three-dimensional phase spaces. In the PHITS simulation, an imaginary spacecraft was irradiated isotropically by cosmic rays with charges up to 28 and energies up to 100 GeV/n, and the dose reduction rates due to water shielding were evaluated for 5 types of doses: the dose equivalents obtained from the LET and linear energy spectra, the dose equivalents to skin and red bone marrow, and the effective dose equivalent. The results of the simulation indicate that the dose reduction rates differ according to the type of dose evaluated. For example, 5 g/cm(2) water shielding reduces the effective dose equivalent and the LET dose equivalent by approximately 14% and 32%, respectively. Such degrees of dose reduction can be regarded to make water shielding worth the efforts required to install it.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
phits
equivalent
heavy-ions
transfer spectra
polyethylene
linear-energy-transfer
particle
code
let-distribution
depth dependence

Niita, K.Research Organization for Information Science and Technology (author)
Shurshakov, V. A. (author)
Yarmanova, E. N. (author)
Nikolaev, I. V.Korolev Energia Space-Rocket Corporation (author)
Iwase, H.Helmholtz Zentrum,Helmholtz Center (author)
Sihver, Lembit,1962Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sihver (author)
Mancusi, Davide,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mancusi (author)
Endo, A.Japan Atomic Energy Agency (author)
Matsuda, N.Japan Atomic Energy Agency (author)
Iwamoto, Y.Japan Atomic Energy Agency (author)
Nakashima, H.Japan Atomic Energy Agency (author)
Sakamoto, Y.Japan Atomic Energy Agency (author)
Yasuda, H. (author)
Takada, M. (author)
Nakamura, T. (author)
Japan Atomic Energy AgencyResearch Organization for Information Science and Technology (creator_code:org_t)

In:Cosmic Research (English translation of Kosimicheskie Issledovaniya)49:4, s. 319-3240010-95251608-3075

By the author/editor: Sato, T.; Niita, K.; Shurshakov, V. A ...; Yarmanova, E. N.; Nikolaev, I. V.; Iwase, H.; show more...; Sihver, Lembit, ...; Mancusi, Davide, ...; Endo, A.; Matsuda, N.; Iwamoto, Y.; Nakashima, H.; Sakamoto, Y.; Yasuda, H.; Takada, M.; Nakamura, T.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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