Exam-style question
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Which type of radiation is least penetrating and can be stopped by a sheet of paper?.
- A.Alpha radiation
- B.Beta radiation
- C.Gamma radiation
- D.All types require the same shielding
Model answer
What a good answer should say
- Alpha radiation
Explanation
Why this works
Alpha radiation is defined as consisting of helium nuclei, which are relatively massive and positively charged. The key difference in penetration is that alpha particles can be stopped by a sheet of paper, while beta particles require denser materials and gamma rays can penetrate much deeper.
Alpha radiation is typically emitted by heavy elements during decay processes, making it the least penetrating type of radiation. Thus, the correct option identifies the minimal shielding requirement for alpha radiation.
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