Question text
38 A radioactive source emitting only gamma radiation is placed in front of a radiation detector which measures the count rate. What must cause the count rate to increase? A a thick sheet of lead placed between the source and the detector B a strong magnetic field placed between the source and the detector C the radioactive source moved closer to the detector D the detector moved further away from the radioactive source
38 A radioactive source emitting only gamma radiation is placed in front of a radiation detector which
measures the count rate.
What must cause the count rate to increase?
A a thick sheet of lead placed between the source and the detector
B a strong magnetic field placed between the source and the detector
C the radioactive source moved closer to the detector
D the detector moved further away from the radioactive source
Select your answer: