Units (Radioactivity)

A Geiger-Müller tube records 90 decays in 3 minutes. Which option correctly expresses this quantity as an activity in SI units?

A radioactive source emits 150 decays in 2.5 minutes. Calculate its activity in Bq.

State the unit used for measuring time when recording radioactive decay in practical investigations.

A class is measuring background radiation. The table shows the counts measured in each of three 60-second intervals:

Describe how you would measure the activity of a radioactive source in the laboratory, naming all units used.

Which of the following combinations is correct for measuring the rate at which a radioactive sample decays?

A class is designing an experiment to compare the ranges of different types of ionising radiation in air. They list the following possible measurements for their experiment: - The distance from the radioactive source to the detector - The thickness of aluminium sheets placed between the source and detector - The number of decays per unit time measured at the detector For each measurement above, identify and justify the most appropriate unit to use according to the syllabus requirements.

In an investigation of half-life, you are told to record the 'interval' for each measurement of activity and to keep the apparatus at the same separation throughout. Name the correct units you would use to record (i) the time interval between measurements and (ii) the separation between the radioactive source and detector. Briefly justify your answers.