Detection of Radioactivity

Detection of Radioactivity problem 17

A radioactive sample is placed close to a detector. The radioactive isotope in the sample has a long half-life. The detector records a count rate of .

The table below shows the readings when different materials are placed between the radioactive sample and the detector.

Explain whether any α-particles, β-particles or γ-rays are emitted by the radioactive sample.


main author and content editor: Noble Menedi Firima