新生児,乳児,子供のガンマ放射性放射性物質
まとめ
新生児や子供には,1962年から1963年にかけて,セシウム137 (Cs-137) やジルコニウム95 (Zr-95) のような微量放射性同位体が見られた. 死んだ胎児は,Zr-95とNiobium-95 (Nb-95) の比率が低く,胎盤移転の違いを示唆しています.
科学分野:
- 環境衛生 環境衛生 環境衛生
- 核医学は,核医学である.
- 小児科は小児科です.
背景:
- 脆弱な集団における放射性核酸体負担の評価は,公衆衛生にとって極めて重要です.
- 乳児と小児における人工放射性核酸の分布と移転を理解することは不可欠です.
- 以前の研究では,1960年代初頭の新生児と子供におけるガンマ放射性同位体について,包括的に評価されていないかもしれない.
研究 の 目的:
- 新生児,死産児,および小児におけるガンマ放射性放射性核酸の濃度を定量化するために.
- セシウム-137 (Cs-137),ジルコニウム-95 (Zr-95),ニオビウム-95 (Nb-95),ルテニウム (Ru-103, Ru-106) などの特定の同位体の存在とレベルを調査する.
- 胎児,乳児,および年上児の間で放射性核素の分布と胎盤の移転における潜在的な違いを探求する.
主な方法:
- 低背景,高感度全身計数装置を使用して,ガンマ活性測定を行いました.
- 1962年4月から1963年4月にかけて,新生児28人,死産児7人,および4歳から15歳の子供21人を検査した.
- 24人の乳児の甲状腺を放射性ヨウ素の含有量について分析した.
主要な成果:
- 子供 (4〜15歳) は,天然のK40と共にZr95) /Nb95),Ru103) / 106およびCs137の痕跡を示した.
- 最も高いCs137濃度は80ピコキュリー/kgで,天然のK40放射能の約4%でした.
- 死んだ胎児は,K ((40) とZr ((95) /Nb ((95) とRu ((103) / ((106) の痕跡を含んでいた. 死んだ胎児と胎盤のZr ((95) /Nb ((95) の比率が低いことは胎盤の差別を示唆した.
結論:
- 乳児と小児は,人工放射性核酸の検出可能なレベルを示し,乳児のCs137 / K40比は高齢者よりも低い.
- 胎盤移植メカニズムがZr95) を差別する可能性があるという証拠があります.
- 乳児の甲状腺に検出可能な放射性ヨウ素は見つかりませんでしたので,研究期間中の暴露は最小でした.
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