A nuclear isotope emits radiation which is detected by a Geiger-Müller tube held at a distance of
about 10cm 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.
C It could be beta and gamma radiation, but not alpha radiation.
D It could be alpha, beta and gamma radiation.
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The answer is A
Alpha because Although alpha particles cannot penetrate the skin, if it gets into the body it can ionise many atoms in a short distance.
Beta because Beta particles are much more penetrating and can travel easily through skin. These particles are stopped by lead