One is freshwater hot springs, which are the radon-containing hot springs that we mentioned just now.
2
温泉宾馆室内氡浓度较高，特别是在房间浴室内使用温泉水时更高。
Higher indoor radon concentrations are found in air-conditioned hot spring hotel rooms, especially in the baths.
3
结果表明，温泉宾馆室内使用温泉水时氡浓度明显高于广东省室内平均氡浓度。
Radon concentration in the hot spring hotel rooms at use of hot spring was higher markedly than the average indoor radon concentration of Guangdong province.
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