Paper No. 35-11 COMPREHENSIVE UTILIZATION OF GAMMA-RAY SPECTROMETRY AND REGIONAL GEOCHEMICAL DATA FOR EVALUATION OF NATURAL IONIZING RADIATION LEVELS IN ZHUHAI CITY URBAN



Paper No. 35-11
Authors will be present from: 9:00 to 11:00 AM, and 3:00 to 5:00 PM

COMPREHENSIVE UTILIZATION OF GAMMA-RAY SPECTROMETRY AND REGIONAL GEOCHEMICAL DATA FOR EVALUATION OF NATURAL IONIZING RADIATION LEVELS IN ZHUHAI CITY URBAN


PAPER WITHDRAWN
It presents an estimation of air-absorbed dose rate from the data of K2O, U and Th content from Chinese regional geochemical database. The absorbed dose rates at 1 m height above the ground due to natural radioactivity nuclides of 238U and 232Th series and 40K are estimated from the data of gamma-ray spectrometry and 1:200000 regional geochemical database in Zhuhai City Urban (ZCU), Guangdong Province, South China.

The calculated average value of radioactivity specific concentration of 238U, 232Th and 40K from regional geochemical data in ZCU is 85.61±35.66, 204.46±88.54 and 681.60±330.14 Bq/kg, respectively, and ranges of 29.64 ~229.71, 64.55 ~397.88 and 127.81 ~1361.55Bq/kg respectively.

The research results show that natural radionuclides’ radioactivity concentrations in the granite areas are higher than that in the Quaternary sediments areas. 238U, 232Th, 40K radioactivity concentration are general high values in the Wugui mountain areas, where covered by Yanshan period biotite granite, and developing of Nanping - Tang Jia fractures.

The average and highest value of absorbed dose in air are 191.47±83.72 and 403.22 nGy/h respectively. The average and highest value of outdoor annual effective dose are 0.23±0.10 mSv and 0.49mSv.

Therefore, based on the contents of radionuclides from stream sediment geochemical database, the radionuclide activity concentration and the terrestrial gamma-ray dose rate at 1 m height above the ground can be calculated, and anomaly distribution in study areas can be delineated. It is a rapid, effective, feasible method for radiation level estimation.

The research was supported by National Natural Science Foundation of China (No. 40174096 and No.41274133).

Session No. 35--Booth# 100

T80. Urban Pollutants and Their Effects on Environmental and Human Health (Posters)
Sunday, 19 October 2014: 9:00 AM-5:00 PM
Vancouver Convention Centre-West Exhibition Hall C
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.109
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