Ivestigate radioactive contamination indoor and do

Ivestigate radioactive contamination indoor and dose estimate for pople
 Zhang wen-tao*  lijing  Hu yang-jun  zhang yun-jiang
(*Chinese Institute of Radiation Protect,Taiyuan030006China.)
Abstract: Objective  In order to realize mostly the background of atmosphere and radonlevel and γradiation level,We investigated radioactive contamination indoor;and found out the ralative contributor of radioaction in the different kinds of room. Methods  We made use of the common measuring methods and REM-III Radon exhalation rate apparatus and DHZM-II Rn-Th measuring instrument to investigate about 200 houses the radon level of atmosphere and water and wall , and the exhalation rate of the floor and the wall, andγradiation level indoor.Results It indicates that the radioactive contamination mostly root in the exhalation of soil and building material,secondly radon outdoor andγradiation,the little contributor for the water and the wall indoor. Conclusions  We set up the datebase abute the measuring results, in order to study on the radioation harming for health ,and offer to the better defending technique.
Key words: Radon indoor , Rodon exhalation rate , γradiation , Radioative dose.