Mrs. Butlerasked the Minister of Health, as representing the Minister for Science, what are the radioactive elements present in radioactive particles of measurable size found in fall-out in Great Britain.
§ Mr. Walker-SmithThe radioactive elements present in these particles, as in all fall-out particles, are principally those arising from fission products such as, for example, Strontium 90, Caesium 137, Zirconium 95 and Niobium 95; and also certain radioactive elements produced in nearby materials during the explosion or present in the particular nuclear device, such as plutonium.