§ Mr. Bestasked 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 EdwardsActivity 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.