5.2.1. Detection of radioactivity
A subsection of Physics, 0625, through 5. Nuclear physics
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A radioactive source is placed 20 mm from a radiation detector, as shown in . 20 mm source lead narrow beam of radiation detector (not to scale) The initial count rate recorded by the detector is 150 counts / s. A sheet of paper is placed between the source and the detector. The count rate recorded by the detector falls to 60 counts / s. With the paper still in place, a magnetic field is set up perpendicular to the direction of the radiation. The count rate recorded by the detector falls to 20 counts / s. The count rates have not been corrected for background. The background count is measured as 20 counts / s. State the evidence that each type of radiation is present in, or absent from, the radiation emitted by the source. α-particles β-particles γ-rays Determine how much of the original count rate of 150 counts / s, if any, is due to each type of radiation. α-particles counts / s β-particles counts / s γ-rays counts / s
0625_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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Questions Discovered
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