Question detail
Explain why alpha radiation is considered strongly ionising but weakly penetrating compared to beta and gamma radiation.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Atoms and nuclear radiation
Question
Explain why alpha radiation is considered strongly ionising but weakly penetrating compared to beta and gamma radiation.
Answer
Alpha radiation consists of heavy helium nuclei, which have a high mass and charge, allowing them to ionise atoms strongly when they collide with matter. However, their large size means they can only travel short distances and are easily stopped by materials like paper or skin, making them weakly penetrating.
Explanation
This question assesses the student's ability to explain the relationship between the ionising power and penetration ability of alpha radiation. It requires a deeper understanding of the physical properties of alpha particles and their interactions with matter.
Common mistake
Misunderstanding Radiation Penetration
Students often confuse the penetration abilities of alpha, beta, and gamma radiation, thinking that alpha radiation can penetrate materials as well as beta or gamma radiation.
Remember that alpha particles are the least penetrating and can be stopped by paper, while beta particles can penetrate paper but are stopped by aluminum, and gamma rays are highly penetrating and require thick lead or concrete to reduce their intensity.
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