§ Mr. Wigleyasked the Secretary of State for Wales if he will publish the locations of the two areas of highest rainfall in Wales from which samples of rainfall have been analysed to detect levels of radiation; and if he will publish a full record of the date and time of readings, and of the level of each of the various forms of radioactivity which were recorded, together with the normal level and the lower emergency reference level for each such type of radioactivity.
§ Mr. Mark Robinson[pursuant to his reply, 19 May 1986, c. 39]The information for iodine 131 and caesium 137, radiologically the most significant radionuclides found in British rainwater following the Chernobyl accident, from samples taken during May at the Wylfa and Trawsfynydd nuclear power stations is as shown in the following table, expressed in becquerels per litre:
351W
Period Iodine 131 Caesium 137 2 days 11,000 51,000 7 days 3,700 15,000 14 days 2,400 7,300 100 days ║1,700 **1,000 * no rain † no activity detected ‡ trace ob/ thyroid limit ** effective limit