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Answer :
The value below that has 3 significant digits is: c) 58 counts
In this value, the digits "5" and "8" are considered significant, and the trailing zero does not contribute to the significant figures. The value "58" has two significant digits.
Q13: The correct count-rate limit of precision for an exactly 24 hour live time count with 4.00% dead time, a count rate of 40.89700 counts/second, and a Fano Factor of 0.1390000 is:
b) 40.90(12) counts/sec
The value has 4 significant digits, and the uncertainty is indicated by the value in parentheses. The uncertainty is determined by the count rate's precision and the dead time effect.
Q14: The detectors that have the risk of a wall effect are:
c) Neutron semiconductor detectors
d) Gamma semiconductor detectors
The wall effect refers to the phenomenon where radiation interactions occur near the surface of a detector, leading to reduced sensitivity and accuracy. In the case of neutron and gamma semiconductor detectors, their thin semiconductor material can cause a significant portion of radiation interactions to occur close to the detector surface, resulting in the wall effect.
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