Evaluation of dose rate reduction in a spacecraft compartment due to additional water shield
Journal article, 2011

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.

transfer spectra

depth dependence

phits

let-distribution

particle

equivalent

heavy-ions

polyethylene

linear-energy-transfer

code

Author

T. Sato

Japan Atomic Energy Agency

K. Niita

Research Organization for Information Science and Technology

V. A. Shurshakov

State Research Center of The Russian Federation - Institute for Biomedical Problems (IBMP)

E. N. Yarmanova

State Research Center of The Russian Federation - Institute for Biomedical Problems (IBMP)

I. V. Nikolaev

Korolev Energia Space-Rocket Corporation

H. Iwase

GSI Helmholtz Centre for Heavy Ion Research

Lembit Sihver

Chalmers, Applied Physics, Nuclear Engineering

Davide Mancusi

Chalmers, Applied Physics, Nuclear Engineering

A. Endo

Japan Atomic Energy Agency

N. Matsuda

Japan Atomic Energy Agency

Y. Iwamoto

Japan Atomic Energy Agency

H. Nakashima

Japan Atomic Energy Agency

Y. Sakamoto

Japan Atomic Energy Agency

H. Yasuda

National Institute of Radiological Sciences

M. Takada

National Institute of Radiological Sciences

T. Nakamura

National Institute of Radiological Sciences

Cosmic Research (English translation of Kosimicheskie Issledovaniya)

0010-9525 (ISSN) 1608-3075 (eISSN)

Vol. 49 4 319-324

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1134/S0010952511040083

More information

Created

10/8/2017