Abstract
At International Symposium in Semipalatinsk (2002) a lot of differences were revealed in dose estimates, depending on the applied methods of retrospective dosimetry, for the areas affected by Semipalatinsk nuclear test site (SNTS) activity. It was suggested to perform international intercomparison of Luminescence Retrospective Dosimetry (LRD) method using brick samples from Dolon' village (Semipalatinsk region, Kazakhstan) affected by nuclear test of 29 August 1949. During field mission (autumn 2002), the team of specialists from Kazakhstan and Japan selected three buildings in the south-eastern part of Dolon' village as sampling locations. Four whole bricks were collected for international intercomparison of LDR method. Brick slices were distributed for measurements between laboratories in Finland, Germany, Japan, Russia, UK and USA. Data on sampling, locations, geographical coordinates, mean Cs-137 soil contamination density near sampling locations, mode of cut of samples for distribution, labeling, condition of transportation, order of samples distribution, as well as main results of the intercomparison were presented at 3rd Dosimetry Workshop on SNTS Area. There was good agreement in estimations of cumulative external absorbed dose by six laboratories. At the depth of 10 mm from external surface of the wall the overall mean value was 210±70 mGy. For given sampling conditions, the free-in-air dose in Dolon would be 420±140 mGy, which is in a good agreement with recent results (Imanaka et al., Simon et al., Stepanenko et al.) of external dose calculations.
