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Detection of Radioactivity

Detection of Radioactivity problem 5

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A teacher holds a radioactive source near a detector. The reading on the detector is . The detector is switched on again after the source has been removed and it shows a reading of . What is the solely due to the source and why is there a reading on the detector when there is no radioactive source present?

	counts /min due to the source	reason for reading with no source
A	300	zero error on detector
B	300	background radiation
C	340	zero error on detector
D	340	background radiation

main author and content editor: Noble Menedi Firima