Physics, 19.10.2020 14:01 dm21930

3 Points The half-value layer for lead for g rays from 60Co is 12.8 mm. An electrometer gave a count rate of 35 pulses per second when at a
certain distance from a source, with no lead between source and detector. If 6 mm of lead were then inserted between source and
detector, the count rate (in pulses per second) would be nearest to:
A. 16
OB. 8
OC. 20
D. 25
OE. 75

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3 Points The half-value layer for lead for g rays from 60Co is 12.8 mm. An electrometer gave a coun...