Radiation Surveys of the McClure Crescent Area of Scarborough, Ontario. Interim Report

摘要

Radiation surveys were carried out in a subdivision in Scarborough, Ontario, to determine the extent of the apparent radium 226 contamination resulting from activities conducted on a farm on the site during the mid-1940's. Air from the interior of all buildings within the area was sampled to determine radon and radon daughter levels. Gamma surveys were conducted at waist level and below the soil surface. Four structures showed above-background radon daughter levels, and four others showed elevated radon gas concentrations. One area of approximately 100 ft exp 2 showed high gamma dose rates, another larger area had above-background gamma readings, and a number of small areas exhibited some gamma activity. It is recommended that approximately 4000 tons of topsoil containing an average of 37 pCi/g of Ra-226 be removed and placed in a radioactive waste storage area. (Atomindex citation 12:632143)