Applications of the microdosimetric function implemented in the macroscopic particle transport simulation code PHITS
Artikel i vetenskaplig tidskrift, 2012
Purpose: Microdosimetric quantities such as lineal energy are generally considered to be better indices than linear energy transfer (LET) for expressing the relative biological effectiveness (RBE) of high charge and energy particles. To calculate their probability densities (PD) in macroscopic matter, it is necessary to integrate microdosimetric tools such as track-structure simulation codes with macroscopic particle transport simulation codes. Methods: As an integration approach, the mathematical model for calculating the PD of microdosimetric quantities developed based on track-structure simulations was incorporated into the macroscopic particle transport simulation code PHITS (Particle and Heavy Ion Transport code System). The improved PHITS enables the PD in macroscopic matter to be calculated within a reasonable computation time, while taking their stochastic nature into account. Applications: The microdosimetric function of PHITS was applied to biological dose estimation for charged-particle therapy and risk estimation for astronauts. The former application was performed in combination with the microdosimetric kinetic model, while the latter employed the radiation quality factor expressed as a function of lineal energy. Conclusion: Owing to the unique features of the microdosimetric function, the improved PHITS has the potential to establish more sophisticated systems for radiological protection in space as well as for the treatment planning of charged-particle therapy.
Microdosimetry
carbon-ion therapy
liquid water radiolysis
local effect
heavy-ions
LET
1976
radiation and environmental biophysics
radiotherapy
radiation physics
beam
radiation
monte-carlo code
radiation
p215
model
protection
dose conversion
RBE
kinetic-model
coefficients
reference computational phantoms
atterjee a
v13
Författare
T. Sato
Japan Atomic Energy Agency
R Watanabe
Japan Atomic Energy Agency
Lembit Sihver
Chalmers, Teknisk fysik, Nukleär teknik
K. Niita
Research Organization for Information Science and Technology
International Journal of Radiation Biology
0955-3002 (ISSN) 13623095 (eISSN)
Vol. 88 1-2 143-150Ämneskategorier
Transportteknik och logistik
Radiologi och bildbehandling
DOI
10.3109/09553002.2011.611216