potassium has a radioactive isotope k 40 with a half life of 125 billion years and a natural abundance of 0012 120 parts per million sea water contains about 380 ppm of potassium 038 grams per litre w

Potassium has a radioactive isotope, K-40, with a half-life of 1.25 billion years, and a natural abundance of 0.012% (120 parts per million). Sea-water contains about 380 ppm of potassium (0.38 grams per litre), which is essential for life. Calculate the radioactivity of sea-water due to the potassium, giving your answer in Bq m−3 .

Potassium as it occurs in nature includes a radioactive isotope $^{40} \mathrm{K},$ which has a half-life of $1.27 \times 10^{9} \mathrm{yr}$ and a relative abundance of 0.0012\%. These nuclei decay by two different pathways $-89 \%$ by $\mathrm{e}^{-}$ emission and $11 \%$ by $\mathrm{e}^{+}$ emission. Calculate the total activity in Bq associated with $1 \mathrm{kg}$ of $\mathrm{KCl}$ due to $\mathrm{e}^{-}$ emission.

Question

Instant Answer