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首页> 外文期刊>Radiation Protection Dosimetry >RADON AND THORON PROGENY IN DUTCH DWELLINGS
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RADON AND THORON PROGENY IN DUTCH DWELLINGS

机译：荷兰民居中的气和T气后代

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Radon and thoron progenies in Dutch dwellings cause similar to 400 cases of lung cancer per year. Some 30% of the risk is due to thoron progeny, which demonstrates that the influence of thoron progeny is much larger than previously anticipated. This was concluded from a national survey in 2500 Dutch dwellings, built since 1930. Radon concentrations (15.6 +/- 0.3 Bq m(-3) on average) are correlated to type of dwelling, year of construction, ventilation system, location (soil type) and smoking behaviour of inhabitants. The survey data support the establishment of a comparatively low national reference level for radon in dwellings in the Netherlands of 100 Bq m(-3), in line with recommendations by WHO and ICRP. Some 24 thousand of the 6.2 million dwellings in the Netherlands (built since 1930) are expected to exceed this level. Around 80% of these are located in the relatively small group of naturally ventilated single-family houses in two designated geographical areas. Radon concentrations above 200 Bq m(-3) are rare in the Netherlands and simple and inexpensive measures will be sufficient to reduce enhanced radon concentrations to values below the national reference level. Thoron progeny concentrations (0.64 Bq m(-3), on average) show correlations with year of construction and smoking behaviour. In 75 additional dwellings, a pilot study was conducted to determine the relationship between the exhalation of thoron from walls and the concentration of thoron progeny in the room. Thoron exhalation values exceeding the median value of 2.2 x 10(-2) Bq m(-2) s(-1) by a factor 10 or more were found frequently, but enhanced concentrations of thoron progeny were measured only occasionally. Under very unfavourable conditions, however, for instance if phosphogypsum is applied as finishing material on all walls and ceilings in the house, strongly elevated thoron progeny concentrations may occur. This survey yielded a maximum recording of 13.3 Bq m(-3). There is no reason to expect that such levels are specific to the Netherlands, indicating that in other regions with low radon levels, thoron may be a more important contributor to the population dose as well.
机译：每年在荷兰人居住的子和子后代每年都会引起约400例肺癌。大约30％的风险是由于虫后代引起的，这表明虫后代的影响要比以前预期的要大得多。这是从1930年以来建造的2500座荷兰住宅中进行的一项全国调查得出的结论。Rad的浓度（平均15.6 +/- 0.3 Bq m（-3））与住宅类型，建造年份，通风系统，位置（土壤）相关。类型）和居民的吸烟行为。根据WHO和ICRP的建议，调查数据支持在荷兰的住宅中建立相对较低的ra参考水平100 Bq m（-3）。荷兰（自1930年以来建造）的620万套住房中，约有2.4万套将超过这一水平。其中约80％位于两个指定地理区域中相对较小的自然通风的单户住宅。 the浓度高于200 Bq m（-3）在荷兰很少见，简单而廉价的措施足以将to浓度降低到低于国家参考水平。 on的子代浓度（平均0.64 Bq m（-3））显示与建造年份和吸烟行为相关。在另外75处住宅中，进行了一项初步研究，以确定墙壁上的ron气呼出与房间中气后代的浓度之间的关系。经常会发现Thoron呼气值超过2.2 x 10（-2）Bq m（-2）s（-1）的中位数，达到10倍或更多，但仅偶尔测量到提高的Thoron后代浓度。但是，在非常不利的条件下，例如，如果将磷石膏用作房屋的所有墙壁和天花板上的饰面材料，则可能会产生strongly离子浓度显着升高的现象。该调查产生的最大记录为13.3 Bq m（-3）。没有理由期望这种水平是特定于荷兰的，这表明在其他ra含量较低的地区，可能也是人口剂量的更重要贡献者。

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