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

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