Over 0.5μSv/h was measured from the street dust in Hirai Edogawa ku Tokyo.
Iori Mochizuki
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Français :
0,5 μSv/h dans les poussières urbaines d’Edogawa à Tokyo
Plus de 0,5 μSv/h ont été relevés dans les poussières d’une rue d’Hirai Edogawa ku Tokyo.
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OFICIUL POSTAL BUCURESTI 22 ROMANIA CASUTA POSTALA 110
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I just measured 2.75μSv/h from black substance in a parking lot in Higashi Funabashi. If I gathered the dust together I suppose that could be doubled or more, but I’m trying to understand why the gamma was not so high as the alpha. (There is an area about 500mx1km where 1μSv/h is common on the ground.) What is it? The measurement shown in the video in Hirai is also not so high; many paved surfaces with no apparent dust measure over 1μSv/h in Hirai and other areas of Edogawa and Katsushika-ku. Even the surfaces of benches in parks are also over 1μSv/h at spots.
Better to use scintillator and mesure spectrum. If you cannot get or make one, you can probably find some one in Tokyo to test this…