การแผ่รังสี, กัมมันตรังสี, เป็นอันตราย, อันตราย, ความตาย, สัญลักษณ์, สัญญาณ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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