Development of software for calculating lung dose for inhaled radon 222 progeny

2015 Fiscal Year Final Research Report

• Project/Area Number: 25340029
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Risk sciences of radiation and chemicals
• Research Institution: Nagoya University
• Principal Investigator: Ishigure Nobuhito 名古屋大学, 医学(系)研究科(研究院), 教授 (70159713)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ラドン / 線量評価 / 呼吸気道モデル / 計算コード

Outline of Final Research Achievements

Lung dose for inhaled radon-222 progeny varies with aerosol parameters in the environment and with subject related parameters such as breathing rate and airway dimension. The purpose of this study is to develop a computer code used for calculating the lung dose per unit exposure to radon-222 progeny in the home and the work places. An updated ICRP human respiratory tract model was incorporated in the present computer code. By using this code, sensitivity analysis in the calculation of lung dose was performed with aerosol parameters. This analysis made clear that evaluation of an unattached fraction of radon progeny plays an important role to determine a dose conversion coefficient inherent to a specific environment. Furthermore, an annual effective dose attributable to the inhalation of radon progeny in Japan was estimated by taking account of the indoor and outdoor radon concentrations in Japan and the physical characteristics and the living hours of the Japanese people.

Free Research Field

放射線防護線量評価