HC Deb 16 July 1986 vol 101 c507W
Mr. Best

asked the Secretary of State for Wales what are the biological half-lives of caesium-134 and -137 which he has adopted for planning purposes in connection with the ban on lamb sales in North West Wales.

Mr. Nicholas Edwards

Activity from radioactive caesium can remain in the tissues of mature animals which have ingested it for a period of between 50 and 100 days although for young animals such as lamb the period is 20 to 30 days.

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