A student measures the level of radiation emitted from a radioactive substance. He places a detector very close to the substance. He puts different absorbers between the radioactive substance and the detector.
The student’s results are shown. These results are corrected for background radiation.
Which types of radiation are being emitted by the substance?
1 )
α-particles and β-particles only
α-particles and γ-rays only
3 )
β-particles and γ-rays only
4 )
α-particles, β-particles and γ-rays
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