Birdwatch Note
2025-04-17 21:39:56 UTC - MISINFORMED_OR_POTENTIALLY_MISLEADING
セシウムの半減期は40年ではありません。 放射性同位体は崩壊して別の元素になるときに放射線を出します。最初にあった放射性同位体の数が半分に減るまでの時間が半減期です。半減期が長いほど1日に発生する放射線は少なくなります。 放射線によるリスクは被曝した放射線量に比例します。 基本的な知識は文部科学省がまとめた副読本で学ぶことができます。 https://www.mext.go.jp/a_menu/shotou/housyasen/1410005_00004.html
Written by 169D2EB0CE4FAED029CE904443460D0C85651746DF09A0E57E6B11180B88C5D0
Participant Details
Original Tweet
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All Information
- ID - 1912984397600690189
- noteId - 1912984397600690189
- participantId -
- noteAuthorParticipantId - 169D2EB0CE4FAED029CE904443460D0C85651746DF09A0E57E6B11180B88C5D0 Participant Details
- createdAtMillis - 1744925996576
- tweetId - 1911355792638513170
- classification - MISINFORMED_OR_POTENTIALLY_MISLEADING
- believable -
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- misleadingOther - 0
- misleadingFactualError - 1
- misleadingManipulatedMedia - 0
- misleadingOutdatedInformation - 0
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- misleadingSatire - 0
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- notMisleadingOutdatedButNotWhenWritten - 0
- notMisleadingClearlySatire - 0
- notMisleadingPersonalOpinion - 0
- trustworthySources - 1
- summary
- セシウムの半減期は40年ではありません。 放射性同位体は崩壊して別の元素になるときに放射線を出します。最初にあった放射性同位体の数が半分に減るまでの時間が半減期です。半減期が長いほど1日に発生する放射線は少なくなります。 放射線によるリスクは被曝した放射線量に比例します。 基本的な知識は文部科学省がまとめた副読本で学ぶことができます。 https://www.mext.go.jp/a_menu/shotou/housyasen/1410005_00004.html
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