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小鼠长期词养于氡子体浓度约500工作水平(WL)的环境中,暴露1—6个月后,大约半数动物出现呼吸道上皮细胞的不典型变化,停吸后继续观察最长的达一年,但并没有发现有真正的肿瘤发生。
In mice exposed to concentrations of about 500 working-hours (WL) for a long term, the mice are exposed to atypical changes in respiratory epithelial cells in about half of animals 1-6 months after exposure and continue to observe the longest A year, but did not find a real tumor.