RADON MEASUREMENTS IN SOME HOUSES OF TSUKUBA SCIENCE-CITY, JAPAN

Measurements concerning radon and its daughter products' concentration levels have been performed in 42 selective houses of the Tsukuba Scie nce City (Japan) using CR-39 and LR-115 nuclear track detectors. These included both single story houses and flats in multi-storied building s. Four CR-39 and four LR-115 detectors were put into a zippable polye thylene bag and a number of such bags were prepared. These detector lo aded bags were then installed in two bedrooms of each of the houses/fl ats and were exposed for a period of three months during the winter se ason (i.e. from December to February). These radon exposed samples wer e then processed, analyzed and related to the Bq/m3. These studies ind icated that the radon levels are very low in the houses surveyed and-d o not pose any serious threat to the occupants.