Question

Tritium is a radioactive isotope of hydrogen that decays by about 5% per year. A large bottle of water that contained 994,200 tritium atoms remained undisturbed for 14 years. How much tritium does the bottle contain now?If necessary, round your answer to the nearest whole number.

Answer 1

Tritiums = 994,200

years = 14

decrease rate = 5 % per year = 5/100 = 0.05 (decimal )

Using the values given:

994,200 ( 1 - 0.05)^14

484,846

Answer:

The bottle contains 484,846 tritiums now.