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?- 14 ?Sv/h from the yellow substance on the roof in Kashiwa Chiba (Fukushima Diary, Aug 10, 2012):
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Around the end of July, I had the professional cleaners wash the roof of our house.
The roof was covered with something like this yellow moss. It was 0.7 ?Sv/h on its surface.I took 20g of it by a kitchen knife. Radiation meter indicated it was red zone, 1.2 ?Sv/h.
I haven’t measured 1.2?Sv/h from merely 20g of sample even around here known to be hotspot.
It was totally washed off after cleaning, radiation level was decreased a little bit, 0.4 ?Sv/h on the surface, but the yellow substance was still with mud in the rain gutter.
I took 3.6 kg of it with the perfect protective clothing (tyvek, gas mask, goggles, plastic gloves).
I packed the clothing soon after taking off the sample, had shower to clean eyes, ears, nostrils carefully.
This is very dangerous, please don’t do it. I can’t take a responsibility if something happened to you.The radiation level was 14 ?Sv/h. I haven’t measured higher than 10 ?Sv/h before. It makes sense why the radiation level is high on the second floor.
We were living with such a thing on our roof..
When I stepped on the roof, I saw the roofs of other houses, most of them were covered with the same yellow substance. Probably the radiation level is high as well.
<End>As reference, in March. 2011, yellow power remained on the street or rain gutters after rain and they measured quite high level of radiation as well. (cf. 2.16 ?Sv/h from yellow powder)
It is not known what the yellow powder was.
The connection between the yellow powder and this yellow substance is not known either.