NATURAL RADIOACTIVITY CONTENT AND RADIONUCLIDES LECHABILITY OF BRICKS CONTAINING INDUSTRIAL WASTE
A study has been carried out using a gamma-ray spectrometric system to determine the natural radioactivity level in bricks made from industrial waste and their associated radiation hazard. Brick-1 and brick-2 contained waste from coal power plant and granite industry, respectively. The leachability of radionuclides from these bricks was also investigated. The activity concentration values of 226Ra, 228Ra, 232Th, and 40K are 64.25, 63.15, 67.9 and 254.19 Bq/kg, respectively in brick-1, and 193, 164.48, 164.63 and 1348.75 Bq/kg, respectively in brick-2. The radiation hazard indexes such as radium equivalent activities (Raeq), representative level index (Iγr), external hazard index (Hex) and internal hazard index (Hin) were calculated and compared with the internationally approved values. Results indicate that brick-1 showed less radiological hazard than brick-2. This suggested that brick-1 could be used in building construction without exceeding the proposed criterion level.The leachability of 226Ra for bricks showed the activity concentration slightly exceeded 1 Bq/L which is the limit generally used for industrial wastewater.