A Geiger-muller tube held at a distance of about 12 cm from a radioactive source. The radiation emitted from the nuclear isotope was entirely stopped by a 2 mm thick sheet of lead.
Which of the statements can be deduced from the above information about the emission from the isotope?
it could be alpha, beta and gamma radiation
it could be beta and gamma radiation, but not alpha radiation
it could be alpha and gamma radiation, but not beta radiation
it could be alpha and beta radiation, but not gamma radiation
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