我局在某铀矿71号竖井工程施工中,由于坑道长,穿脉、峒室多,弯曲度大;加之矿体暴露面积大,地质上又不允许密闭,给通风和氡、尘防护工作带来很大困难,氡尘浓度有时超标几十倍。后来,我们采用φ320mm 钻孔通风,从而使坑内的氡气由原来的5～7×10~(-10)Ci/L 降低为1.3×10~(10)Ci/L,氡子体潜能值由23.5GB 降至0.68GB,矿尘由3mg/m~3降到0.6～1.0mg/m~3。铀矿地质勘探坑道,绝大多数是独头坑道,并且平巷居多,一般采用混合式通风即 Bureau of a uranium shaft in the construction of a 71, due to the tunnel long, wear pulse, the room more than a large curvature; combined with large exposed area of ​​the ore, geology does not allow airtight, ventilation and radon, dust protection work Bring great difficulty, sometimes the concentration of radon dust several times over. Later, we used φ320mm borehole ventilation to reduce the radon in the pit from 1.3 × 10 ~ (10) Ci / L from 5 ~ 7 × 10 ~ (-10) Ci / L to 23.5GB down to 0.68GB, mine dust from 3mg / m ~ 3 down to 0.6 ~ 1.0mg / m ~ 3. Uranium geological exploration tunnels, the vast majority of single-head tunnel, and the majority of lanes, the general use of hybrid ventilation