Applications of the microdosimetric function implemented in the macroscopic particle transport simulation code PHITS
Paper i proceeding, 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.

atterjee a

1976

LET

p215

model

local effect

protection

v13

RBE

monte-carlo code

radiotherapy

carbon-ion therapy

liquid water radiolysis

kinetic-model

reference computational phantoms

dose conversion

beam

radiation physics

heavy-ions

radiation

radiation and environmental biophysics

Microdosimetry

radiation

coefficients

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)

Vol. 88 1-2 143-150

Ämneskategorier

Radiologi och bildbehandling

DOI

10.3109/09553002.2011.611216

Mer information

Senast uppdaterat

2021-07-22