A Levels Physics

A nuclear isotope emits radiation which is detected by a Geiger-Müller tube held at a distance of
about 10 cm from the radioactive source. The radiation is stopped completely by a 2mm thick
sheet of lead.
What can be deduced from this information about the emission from the isotope?
A It could be alpha and beta radiation, but not gamma radiation.
B It could be alpha and gamma radiation, but not beta radiation.
It could be beta and gamma radiation, but not alpha radiation.
D It could be alpha, beta and gamma radiation.


Radioactive Decay | 2012 - O/N - 9702/13 | Q38