Estimation of terrestrial air-absorbed dose rate from the data of regional geochemistry database

Abstract

This paper presents an estimation of air-absorbed dose rate from the data of K 2 O, U and Th content from Chinese regional geochemical database. A total of 421 group original data of combined samples in Zhongshan City (ZSC), Guangdong Province and south China were extracted from the national geochemical database. Estimated average value of air-absorbed dose rate is 139.4 nGy h −1 in the granite area and 73.7 nGy h −1 in the sedimentary area. The level of air-absorbed dose rate is closely related with the surface lithology. Estimated mean air-absorbed dose rate approximates to the measured average value by a portable plastic scintillator dosemeter in Zhuhai City were bordered with ZSC. The results show that the pre-evaluation of ionizing radiation level using regional geochemical data is feasible.

Annual effective dose and air absorbed dose based on airborne and ground gamma-ray spectrometry - Serra do Carambeí and Joaquim Murtinho granites, southern Brazil

“…Radiation dose estimates are possible based on the K (%), U eq (ppm) and Th eq (ppm) measurements. The International Atomic Energy Agency (IAEA 1991) and the International Commission on Radioactive Units of Measurements (ICRU 1994) recommended an air absorbed dose (AAD) estimation based on airborne gamma-ray spectrometric surveys (Ye & Gan 2013, Beamish 2016, according to equation (1): AAD (nGy hˉ1) = 13.078 K + 5.675 U eq + 2.496 Th eq…”

“…Several epidemiological studies have been designed to assess hazards from exposure to natural radiation (Grastly & LaMarre 2004, Ye & Gan 2013, Oatway et al 2016. A large effort is being made by nations to understand and minimize the consequences of this that, although it is a natural process, it can entail damages to human's health when background radioactivity reaches high levels (US EPA 1993;EC 1999;UNSCEAR 2000).…”