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Radiation Protection Dosimetry Advance Access originally published online on November 28, 2006
Radiation Protection Dosimetry 2006 122(1-4):41-45; doi:10.1093/rpd/ncl407
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Development of a calculation method for estimating specific energy distribution in complex radiation fields

Tatsuhiko Sato1,3,*, Ritsuko Watanabe1,3 and Koji Niita2,3

1 Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency (JAEA)
2 Research Organization for Information Science and Technology (RIST)
3 Present Address: Shirakata-Shirane 2-4, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

* Corresponding author: sato.tatsuhiko{at}jaea.go.jp


  Abstract

Estimation of the specific energy distribution in a human body exposed to complex radiation fields is of great importance in the planning of long-term space missions and heavy ion cancer therapies. With the aim of developing a tool for this estimation, the specific energy distributions in liquid water around the tracks of several HZE particles with energies up to 100 GeV n–1 were calculated by performing track structure simulation with the Monte Carlo technique. In the simulation, the targets were assumed to be spherical sites with diameters from 1 nm to 1 µm. An analytical function to reproduce the simulation results was developed in order to predict the distributions of all kinds of heavy ions over a wide energy range. The incorporation of this function into the Particle and Heavy Ion Transport code System (PHITS) enables us to calculate the specific energy distributions in complex radiation fields in a short computational time.


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