Detection of Radioactivity

Detection of Radioactivity problem 14

A radiation detector is placed on the bench in a laboratory. It detects a background count rate of .

  • State what is meant by background radiation. Suggest one source for it.

  • A sample containing atoms of the radioactive isotope Polonium-208 is removed from a

    lead container and brought close to the detector. The average count rate increases to .

    When two sheets of paper are inserted between the sample and the detector, the average count rate returns to . Polonium-208 is represented by the symbol . It decays to an isotope of lead (Pb).

    • Deduce the type of radiation emitted by polonium-208. Explain your answer.

    • Write down the nuclide equation for the decay of polonium-208.


main author and content editor: Noble Menedi Firima