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作者报道了对美国全国及匹兹堡地区低收入(年收入低于15000美元)家庭中~(222)Rn浓度的调查结果.在1986年3月至1987年4月期间总共调查了32740个家庭,其中低收入家庭有808个.~(222)Rn浓度用扩散栅活性炭吸附探测器(DBCA)测量.匹兹堡地区的调查对象有三个来源:①那些自新闻媒介得知匹兹堡大学愿免费为送来食品印花认可购买卡(Food stamp anthorization-to-purchase card)副本的家庭测量~(222)Rn浓度消息后,主动送来这一证件副本的低收入家庭有101户;②通过随机选择
The authors report the results of a survey of the concentration of ~ (222) Rn in low-income (annual income less than $ 15,000) households in the United States and Pittsburgh, and a total of 32,740 households were surveyed between March 1986 and April 1987, of which There are 808 low-income families.222 The concentration of Rn is measured by a diffusion-gate active carbon adsorption detector (DBCA) The Pittsburgh area has three sources for investigation: (1) those who learned from the news media that the University of Pittsburgh is willing to send food stamps for free Households who have received a copy of the Food stamp anthorization-to-purchase card measure 101 Rn concentration, and 101 households have taken the initiative to send this copy of the certificate to their low-income families.