Radiation transport in a substance or a human body
When the radiation (particle) enters a substance or a human body, the radiation change the direction of flight, or produce secondary particles and the substance or the human body absorbs energy due to interactions. These physical phenomena occur in stochastic and then can be simulated by computer simulation techniques. |
About us
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In recent years, a computer simulation technique that can analyze radiation transport in material
or human bodies is quite essential for progressing researches in the field of nuclear and radiation science.
In our group, we conduct researches to develop a radiation transport simulation code, PHITS, and to improve the reliability of the code.
We also apply the simulation code to industrial, scientific and medical studies. In addition, we develop new methods and database for radiation dose assessment and progress researches of internal exposure from insoluble radioactive material, basic radiation science and so on. |
Recent topics
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Particle and Heavy Ion Transport code System (PHITS) |
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PHITS is a general purpose Monte Carlo particle transport simulation code developed under collaboration between JAEA, RIST, KEK
and several other institutes. It can deal with the transport of all particles over wide energy ranges,
using several nuclear reaction models and nuclear data libraries. PHITS can support your researches in the fields of accelerator technology,
radiotherapy, space radiation, and in many other fields which are related to particle and heavy ion transport phenomena. [->Detail] |
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Analyses of personal dose equivalent measured by dosimeters for radioactive cesium deposited in environment (2018/05/15) |
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Radiation dose measurement using dosimeters are conducted to grasp exposure dose to public following the nuclear accident of the TEPCO Fukushima Daiichi Nuclear Power Plant.
We analyses personal dose measured by a dosimeter that is put on chest surface of a human body for various age groups (newborn, 1y 5y, 10y 15y and adult)
in an environment with gamma-rays emitted from radioactive cesium.
From the analyses, data are prepared to correlate the personal dose to the effective dose that can explain the radiation exposure dose for a person.
The results show us the validity of the radiation control by a dosimeter for public in an environment.
[->Detail] |
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Radiation doses and their correlations for radiological protection (2018/05/15) |
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We explain definitions of radiation doses and their correlations for radiological protection.
[->Detail] |
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The name of our group has been changed (2015/04/01) |
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The new name of our group is changed as "Research Group for Radiation
Transport Analysis" from "Research Group for Radiation Protection" on
April 2015.
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Practical use of a dose assessment system (WAZA-ARIv2) for patients in CT scan (2015/01/30) |
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The Research Group for Radiation Transport Analysis developed a dose
calculation system named WAZA-ARIv2
[https://waza-ari.nirs.qst.go.jp/] for set up of CT scan
condition in medical institution under the collaboration research
project with the National Institute of Radiological Sciences and the
Oita University of Nursing and Health Sciences. Practical use of
WAZA-ARIv2 began on January 30, 2015. In WAZA-ARIv2, new functions,
which enable us to perform accurate dose calculation against patients
with various ages and physiques, are added to trial version of
WAZA-ARI. Then, WAZA-ARIv2 enables medical service workers to reduce
and manage radiation dose for the patient at their medical
institution.
[->Detail] |
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Calculation of dose conversion coefficients for external exposure to radioactive cesium distributed in soil (2014/08/05) |
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Radioactive cesium (Cs-134 and Cs-137) is the most important nuclides
for the medium- and long-term dose estimation in the accident of the
TEPCO Fukushima Daiichi Nuclear Power Plant Station because of the relatively long
half-lives and high energies of emitted gamma rays. Based on the latest
models to simulate the environmental radiation transport, we
calculated the first data set of age-dependent dose-conversion
coefficients (DCCs) to assess effective dose of new-borns, 1-, 5-,
10-, and 15-year-old children, and adults for external exposure to
radioactive cesium distributed in a soil. The derived data has been
published as an original article of JNST. Those data are expected to
be applicable to dose estimation of the public exposed to gamma rays
from radioactive cesium in soil.
[->Article on the JNST website] |
Copyright© Japan Atomic Energy Agency, Research Group for Radiation Transport Analysis
Last modified: October, 2021. (Since: October, 2005.)