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Memorandum
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I recorded this sound at the point where I took the center picture in
this page, as usual.
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On this day, it was rare that some birds were twittering on the branch of the
trees around this temporary storage site: therefore, the twittering of the
birds were heard from very nearer than usual. However, no birds were on the
green vinyl sheet.
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I could hear the voices of high school students working out at the stairs
from the bottom of the park to the center square where the monitoring post
was installed.
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The monitoring post near the site showed 0.15 μSv/h. (right picture)
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