Question text
36 A sample of a radioactive isotope with a very long half-life is placed next to a detector. Sheets of different materials are inserted, one at a time, between the radioactive sample and the detector. The background count rate is subtracted from the readings on the detector and the corrected count rates are recorded in the table. corrected count rate type of material counts/s no sheet inserted 450 thin aluminium sheet 381 thin lead sheet 285 thin paper sheet 452 Which types of radiation are emitted by the radioactive sample? A alpha-particles and beta-particles only B alpha-particles only C beta-particles and gamma radiation only D gamma radiation only
36 A sample of a radioactive isotope with a very long half-life is placed next to a detector. Sheets of
different materials are inserted, one at a time, between the radioactive sample and the detector.
The background count rate is subtracted from the readings on the detector and the corrected
count rates are recorded in the table.
corrected count rate
type of material
counts/s
no sheet inserted 450
thin aluminium sheet 381
thin lead sheet 285
thin paper sheet 452
Which types of radiation are emitted by the radioactive sample?
A alpha-particles and beta-particles only
B alpha-particles only
C beta-particles and gamma radiation only
D gamma radiation only
Select your answer: