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Memorandum
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On an extremely hot day, some children were playing in the fountain at the
bottom of the Mt. Shinobu park.
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When I prepared to record the sound, some workers were watering and cleaning
the park around the monitoring spot. However, when I just started recording
this sound, they started resting under the trees.
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On this day, few cicadas sing at this park, therefore, I could clearly hear
the twittering of birds.
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The monitoring post at this park showed 0.148 μSv/h. (right picture).
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