Radiation Q: C Answr w/1cm Alum Plate?

Thread starter User1265
Start date Oct 4, 2019
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Radiation

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SUMMARY

The discussion centers on the behavior of beta particles when interacting with a 1 cm thick aluminum plate in radiation detection scenarios. The consensus is that while beta particles can be stopped by aluminum, the presence of a consistent count rate even after the source is removed indicates that other factors are influencing the readings. This suggests that not all beta particles are being absorbed by the aluminum plate, and additional sources of radiation may be present. The conclusion emphasizes the importance of considering all variables in radiation detection experiments.

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Understanding of beta radiation and its properties
Knowledge of radiation detection methods and equipment
Familiarity with the concept of count rate in radiation measurements
Basic principles of material interaction with radiation, specifically aluminum

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Study radiation detection techniques and their limitations
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Oct 4, 2019

User1265

Homework Statement: 12. A radioactive source is placed 6 cm from a radiation detector sensitive to all
forms of ionizing radiation, and records 74 counts/minute. When a 1 cm
thick aluminium plate is placed in the gap then the count rate falls to
45 counts/minute. If the source is removed entirely then the count rate
remains the same. If the aluminium plate is removed and the source is
placed 2 cm from the detector, the count rate rises to 5000 counts/minute.
What forms of radiation does the source emit?
A alpha only B beta only
C alpha and beta D alpha and gamma

Why is the Answer A and Not C?

Relevant Equations: Alpha, beta gamma

I thought the answer was C because what's not to say when surface is placed 6 cm from radiation detector beta particles are also present, and that surely all beta particles would be stopped with a 1cm thick aluminium plate?