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目的 探讨对由某些建材引起的高放射性居室可采用的有效控制技术措施 ,以改善居室卫生质量。方法 通过对致高放射性居室的某些含天然放射性水平建材的研究 ,采用降低可控源建材产品天然放射性水平和室内补救性降氡新成果技术观察控制效果。结果 致居室高放射性建材产品γ照射量率由 76 .8× 1 0 -8Gy·h-1,氡浓度2 35 .0 2Bq·m-3 分别下降 6 4 .9%、70 % ,均达国家标准限值要求 ;已建高氡住房氡浓度由原均 2 43.5 6Bq·m-3 降至 5 1 .1 5Bq·m-3 ( <1 0 0Bq·m-3 ) ,显著改善了公众室内卫生质量。结论 居室高放射性主要源于放射性超限值建材。对其加强监测和有效防护是改善居室放射卫生质量的重要措施。
Objective To explore effective control techniques and measures that can be applied to high-radiation living room caused by certain building materials so as to improve the quality of residential hygiene. Methods Based on the study of some natural radioactive building materials with high activity in living room, the control effect was observed by using the new technology to reduce the natural radioactivity of controllable building materials and the indoor remedial radon lowering technology. As a result, the γ irradiation rate of high radioactive building materials in the living room decreased by 76.8 × 10 -8 Gy · h -1 and the radon concentration was 23.4% and 70% respectively Standard radon concentration requirements; radon concentration of high-radon houses has been reduced from an average of 2 43.5 6Bq · m-3 to 5 1 .1 5Bq · m-3 (<1 0 0Bq · m-3), significantly improving public indoor sanitation quality. Conclusion The high radioactivity of living room mainly comes from radioactive over-limit building materials. To strengthen its monitoring and effective protection is an important measure to improve the quality of living room radiotherapy.