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1. A radioactive sample has a half-life of 4 hours. If you start with 48g, how much will remain after 12 hours?
2. In a nuclear equation, what does ⁴₂He represent?
3. What happens to the atomic number of an element after beta decay?
4. A Geiger counter records 1200 counts in 1 minute. If background radiation is 20 counts per minute, what is the true count rate in counts per second?
5. Which combination of properties correctly describes gamma radiation?
6. A source initially has 640 unstable nuclei. After 40 minutes, 80 nuclei remain. What is the half-life?
7. Why is alpha radiation particularly dangerous if ingested but relatively safe externally?
8. What thickness of lead would reduce gamma radiation intensity to 25% of its original value if 2mm of lead reduces it to 50%?
9. During which nuclear decay does the mass number remain unchanged but the atomic number increase by 1?
10. Why is background radiation higher in Cornwall than in most other parts of the UK?