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Radon is a human carcinogen and a serious public health problem. High radon inhalation for long periods can increase the risk of lung cancer. There are many studies in Thailand focused on the radon hazard posed in the home. However, no report of its level in school for children is observed. Children have been reported to have greater the risk than adults for certain types of cancer from radiation and children spend much of their time at school next on down their home. In this study, the indoor radon concentrations obtained from 9 schools in the Northeastern of Thailand were measured by solid state nuclear tract detectors (SSNDTs) using CR-39 detectors in closed cups, by a short-term test (90 days). Radon cups were placed in the different ground floor of kindergarten classrooms for 8 cups per room. The indoor radon concentrations (Bq/m