Modelling the effect of mechanical remediation on dose rates above radiocesium contaminated land

Malins, A.; Kurikami, Hiroshi; Kitamura, Akihiro; Machida, Masahiko

Remediation Measures for Radioactively Contaminated Areas, p.259 - 272, 2019/00

https://doi.org/10.1007/978-3-319-73398-2_12

A Computational approach for an object situated alone in infinitely expanded radiation field by Monte Carlo codes using reflection boundaries

Furuta, Takuya; Takahashi, Fumiaki

no journal, , 

The conventional approach to compute radiation dose for an object in infinitely expanded radiation field by Monte Carlo codes is very inefficient because extremely large is necessary to approximately consider the infinitely expanded radiation field and the probability an initiated radiation to hit the target object is tiny. We therefore proposed an approach to efficiently compute radiation dose in the target object by considering radiation transport in a computational volume of the size slightly larger than the object using reflection boundaries. Firstly radiation transport enclosed in the computational area by the reflection boundaries at the borders was computed without setting the object and the position and momentum of the radiations were recorded just after the reflections. Secondly radiation dose exposure to the object from radiations originated inside and radiations incoming to the area from exterior was computed by setting the object and removing reflection boundaries. The radiation records in the first step are simulating the incoming radiations from infinitely expanded radiation field and thus the radiation dose of the object in infinitely expanded radiation field can be evaluated. The required computational time of our approach was a hundred times shorter than that of the conventional approach. We demonstrate the validity of our approach showing several example applications in this presentation.