What types of radiation are being emitted by the source

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A detector of nuclear radiation is placed close to a radioactive source. When a sheet of paper is placed between the source and the detector, the measured count rate from the source is unaltered. When a sheet of aluminum which is a few millimeters thick replaces the paper, the count rate from the source is reduced, but not to zero. What types of radiation are being emitted by the source?

Reference no: EM132512681

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