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6351709 
Journal Article 
Light Weight Concrete: super(226)Ra, super(232)Th, super(40)K Contents and Dose Reduction Assessment 
Yu, KN; Guan, ZJ; Cheung, TTK; Lo, TY; Cheung, T 
2000 
Yes 
Applied Radiation and Isotopes
ISSN: 0969-8043 
53 
6 
975-975 
The radium 226, thorium 232, and potassium 40 content of four types of light weight concrete (LWC) commonly used in Hong Kong was determined. The radionuclide contents of all samples, except for pulverized fuel ash (PFA) autoclave aerated concrete, were below world averages for building materials. The Ra equivalents for autoclave aerated concrete plus lime, autoclave aerated concrete plus PFA, concrete with synthetic aggregate, and concrete with polystyrene bean as aggregate were 49.6, 249, 122, and 44.2 Bq/kg, respectively. The gamma dose rate for an indoor environment with partition walls constructed of LWC was estimated to be about 20 x 10 super(-8) Gray/h, corresponding to a reduction in the effective dose of about 0.25 mSv/yr when compared with that obtained for construction with normal concrete. 
HONG KONG; RADIATION; RADIUM 226; POTASSIUM 40; THORIUM 232/