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    How do I do these types of questions, they're so confusing. I have the mark scheme but its not helping me, can someone show me how to do the questions step by step

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    (Original post by alen52213)
    γ source gives mean 2010 counts/min at 0.15 m. Inc distance by factor 6 to 0.9 m, the rate dec by factor 36, as intensity ∝ 1/d^2.

    Source gives mean (integer) 56 counts/min at 0.9 m; a mean recording of 96 counts/min.

    Mean rates as 1) radioactive decay is random 2) count rate drops even for small Δt (mins).
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