§ Mr. AltonTo ask the Secretary of State for Health how quickly iodine tablets have to be administered following exposure to iodine 131 to be(a) 100 per cent. effective and (b) 50 per cent. effective in counteracting the effects of radioactive iodine.
§ Mr. FreemanI am advised that experiments have shown that a dose of up to 100mg of stable iodine is almost 100 per cent, effective if taken immediately before or at the time of exposure to radioactive iodine. It is still 50 per cent. effective if taken about five hours after exposure.