5,000 students of 64 schools in Setagaya will go for school trip in Gumma,where is 0.558μSv/h.

5,000 students of 64 schools in Setagaya will go for school trip in Gumma,where is 0.558μSv/h.
Normal Geiger counter beeps when it’s higher than 0.3μSv/h.

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