A radioactive material is placed near a detector.
The detector shows a count rate of 28 000 counts /min.
When a piece of card is put between the material and the counter, the reading decreases to 25 000 counts /min.
When an aluminium sheet is put between the material and the counter, the reading remains at 25 000 counts /min.
When a sheet of lead is put between the material and the counter, the reading decreases to 19 000 counts /min.
What is being emitted by the radioactive material?
1 )
α, β and γ-radiation
2 )
α and β-radiation only
α and γ-radiation only
4 )
β and γ-radiation only
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