经常开窗换气还是很重要的
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#56 Re: 经常开窗换气还是很重要的
不能理解,所有的放射性物质都有可以被吸入,而且被吸入后可以进入身体的任何部位,也可以影响身体的任何部位,这就是早年大部分科学家不相信的原因么
https://cheec.uiowa.edu/sites/cheec.uio ... 0Study.pdf
iowa的文章你可以自己看
https://cheec.uiowa.edu/sites/cheec.uio ... 0Study.pdf
iowa的文章你可以自己看
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#57 Re: 经常开窗换气还是很重要的
假如你桌子上有块U235,你讲讲它怎样才能进入身体?赖美豪中 写了: ↑2月 27, 2024, 1:25 pm 不能理解,所有的放射性物质都有可以被吸入,而且被吸入后可以进入身体的任何部位,也可以影响身体的任何部位,这就是早年大部分科学家不相信的原因么
https://cheec.uiowa.edu/sites/cheec.uio ... 0Study.pdf
iowa的文章你可以自己看
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#61 Re: 经常开窗换气还是很重要的
你是狗屁不通,一个常识就是楼上开窗风大,造成更大的压强差,你的randon gas浓度只能更高,而不是更低。这就是为啥真要装设备也只能装在地下室
VladPutin 写了: ↑2月 27, 2024, 1:19 pm 找到airthings实测的测量精度,书短期只用一位有效数字非常正确。
The Accuracy of Airthings Radon Detectors
Within the first week, the accuracy levels of Airthings's two residential devices (Wave and Home) are within 10% at one standard deviation, measured at 200 Bq/m3, 5.4 pCi/L. After a month, the accuracy increases drastically to within 5% at one standard deviation, measured at 200 Bq/m3, 5.4 pCi/L. As the device gathers data, the accuracy of readings increases drastically. Airthings's Professional devices, Plus and Pro, provide very high levels of accuracy. The Plus measures at just 12% accuracy after a week and 9% after a month, measured at 50-to-350 Bq/m3. The Pro boasts an impressive 7% accuracy after 24-hours and less-than-5% after a week.
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#70 Re: 经常开窗换气还是很重要的
必须买贵很多的才测得准?
那种说法非常耳熟了我整个变成大人后的人生。
“便宜没好货!”
https://www.epa.gov/radon/radon-frequen ... -questions
https://www.epa.gov/radon/are-radon-mea ... d-reliable
Are radon measurements accurate and reliable?
EPA has maintained the position that radon measurement systems provide practical and affordable measurements that can give consumers the information they need about the radon level in their home in order to make a decision about whether to fix their home. Since EPA based this position on studies conducted earlier, we decided, in consultation with Office of Inspector General (OIG), to check the current state of device measurement accuracy.
This is a link to a contractor report that reviews current radon measurement proficiency data and compares it to earlier data -- Radon Device Performance Check. The report also provides a response to the OIG report regarding oversight of radon testing device accuracy and reliability (Rpt. No. 09-P-0151).
Results presented in this report support EPA’s position that radon testing devices provide accurate and reliable results and that EPA’s measurement recommendations raise the probability that high homes will be identified and fixed. While any measurement system has an associated variability in precision and accuracy, we expect that radon test devices that are used properly will provide accurate and reliable results.
The study presented here only represents a part of the picture of accuracy and reliability. Other efforts must be employed to contribute to this knowledge base; such as, blind studies carried out in the field, participation in the development of technical standards through private-sector, consensus-based processes, support of state program technical needs and assessments
of test chamber error.
https://www.epa.gov/sites/default/files ... rmance.pdf
https://www.epa.gov/radon/find-radon-te ... ofessional
那种说法非常耳熟了我整个变成大人后的人生。
“便宜没好货!”
https://www.epa.gov/radon/radon-frequen ... -questions
https://www.epa.gov/radon/are-radon-mea ... d-reliable
Are radon measurements accurate and reliable?
EPA has maintained the position that radon measurement systems provide practical and affordable measurements that can give consumers the information they need about the radon level in their home in order to make a decision about whether to fix their home. Since EPA based this position on studies conducted earlier, we decided, in consultation with Office of Inspector General (OIG), to check the current state of device measurement accuracy.
This is a link to a contractor report that reviews current radon measurement proficiency data and compares it to earlier data -- Radon Device Performance Check. The report also provides a response to the OIG report regarding oversight of radon testing device accuracy and reliability (Rpt. No. 09-P-0151).
Results presented in this report support EPA’s position that radon testing devices provide accurate and reliable results and that EPA’s measurement recommendations raise the probability that high homes will be identified and fixed. While any measurement system has an associated variability in precision and accuracy, we expect that radon test devices that are used properly will provide accurate and reliable results.
The study presented here only represents a part of the picture of accuracy and reliability. Other efforts must be employed to contribute to this knowledge base; such as, blind studies carried out in the field, participation in the development of technical standards through private-sector, consensus-based processes, support of state program technical needs and assessments
of test chamber error.
https://www.epa.gov/sites/default/files ... rmance.pdf
https://www.epa.gov/radon/find-radon-te ... ofessional
上次由 meiyoumajia 在 3月 14, 2024, 12:19 pm,总共编辑 2 次。
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#76 Re: 经常开窗换气还是很重要的
你应该看我引用的EPA提到的调查报告。对浓度不低的情况,11年前各种测试仪器就已经改善到很准了。几乎都在15%以内。因此我说家里完全没有必要用贵的测试仪器(前面有人说用2000美元以上的才可靠)。
除非你在做比较精确的科学实验,或者你家里浓度特别低,或者你用的方法不对(比如放在房中离所有源头最远的地方),否则需要测“一两个”星期那肯定是测试装置坏掉了。如果家里浓度达到了需要关注的程度,应该最多用1-2小时才对。也就是说:如果浓度高到需要关注,1-2小时应该足够可以测出;如果浓度是安全的,读数也就会是个安全值----虽然百分比误差可能会较高。
这人做了一个测试比较。在浓度非常低的情况下,结果有些定性,但贵的和普通测试装置得出的测试结果没有根本性区别。都在说:浓度低到足够安全。
到此应该比较全面地说清楚了吧?
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#77 Re: 经常开窗换气还是很重要的
感觉还是有必要说得更清楚。
接我在前面的两贴。
1个数据:20年前英国家用天然气中的浓度是5.4上下
对这种浓度很容易而且很快可以被那种150美元上下的家用测试仪测出----如果在某些时候放在某些特定的地方。
家中每天的浓度也会随着人的活动/行为有比较大的浮动。
https://pubmed.ncbi.nlm.nih.gov/11843341/
对楼主的那种价格的测试仪很可能会是像下述情况:::::::::
假设在某一天选择几个时段做多次测试。每次做1小时左右的测试。
几种可能:
1. 如果每次显示不高于4,假设测量误差单向幅度是20%(这应该是非常保守的初略估计),实际浓度应该低于5。
2.如果每次显示不高于2,假设30%,实际浓度应该都低于2.86。
3.如果每次显示不高于1.5,假设40%,实际应该低于2.5
::::::::::::
因此,我感觉测量显示值不高于2就不会有特别大的问题---如果是放在浓度明显偏高的被侵入的地方测。
否则可能应该采取办法把浓度降下来。
(我自己住的是1970年代的老房子。平房。地板层离地有半米距离,在3面每个有2个通风口。我们过去8年都只用电(从做饭到取暖),除了在车库烧洗澡水。差不多每天白天都有人在家,在冬天白天都会对厨房和living room通风,除非阴天下雨。感觉再没有什么可做的。因此我自己从来没测过。但家里的墙壁和房屋周围多处土壤都在实验室做过重金属测试。)
接我在前面的两贴。
1个数据:20年前英国家用天然气中的浓度是5.4上下
对这种浓度很容易而且很快可以被那种150美元上下的家用测试仪测出----如果在某些时候放在某些特定的地方。
家中每天的浓度也会随着人的活动/行为有比较大的浮动。
https://pubmed.ncbi.nlm.nih.gov/11843341/
对楼主的那种价格的测试仪很可能会是像下述情况:::::::::
假设在某一天选择几个时段做多次测试。每次做1小时左右的测试。
几种可能:
1. 如果每次显示不高于4,假设测量误差单向幅度是20%(这应该是非常保守的初略估计),实际浓度应该低于5。
2.如果每次显示不高于2,假设30%,实际浓度应该都低于2.86。
3.如果每次显示不高于1.5,假设40%,实际应该低于2.5
::::::::::::
因此,我感觉测量显示值不高于2就不会有特别大的问题---如果是放在浓度明显偏高的被侵入的地方测。
否则可能应该采取办法把浓度降下来。
(我自己住的是1970年代的老房子。平房。地板层离地有半米距离,在3面每个有2个通风口。我们过去8年都只用电(从做饭到取暖),除了在车库烧洗澡水。差不多每天白天都有人在家,在冬天白天都会对厨房和living room通风,除非阴天下雨。感觉再没有什么可做的。因此我自己从来没测过。但家里的墙壁和房屋周围多处土壤都在实验室做过重金属测试。)
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#78 Re: 经常开窗换气还是很重要的
对了。也要看居住的地理位置和其它相关情况。比如,在宾州有不少地方,平均的家中浓度会高得惊人。有一种说法/研究结论是:地下开采用水压技术而使得问题更严重。
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#79 Re: 经常开窗换气还是很重要的
我家的没有安装前是200多,安装后是2, 但几年没测了,
另外radon致癌有定论吗?就怕医学界下定论,it一下定论就会推翻自己的定论
另外radon致癌有定论吗?就怕医学界下定论,it一下定论就会推翻自己的定论