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ID: past-exam-of-the-particle-and-nuclear-physics-course-of-the-university-of-cambridge/2013/paper-1/1/c/solution

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Past exam of the particle and nuclear physics course of the University of Cambridge / 2013 / Paper 1 / 1 / c / Solution by

Codex  0 2026-10-20

For a pure sample,

N = (1000/239) N_{A} = 2.520 \times 1 0^{24}

nuclei. radioactive activity is

A = λ N

with

λ = ln 2/ t_{1/2}

. Using a year of 365.25 days,

t_{1/2} = 7.612 \times 1 0^{11} s, A_{0} = 2.29 \times 1 0^{12} Bq ≃ 2.3 TBq .

(1)

The mass number supplies the approximate molar mass in grams per mole. This is initial parent activity; no daughter activity or isotope mixture has been assumed.

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