Question

2. Aa consequence of a fall-out, two radioactive beta emitting isotopes are released. Tritium, with a physical half-life time of 12 years and an average beta energy of 6keV, and¹³⁷Cs, with 30 years half-life time and an electron with average energy of 170 keV (we neglect the also emitted high energy y-ray here)

   1. a) A human of 100Kg ingests 107 Bq of tritium and 10³ Bq of ¹³⁷Cs. No additional activity is taken in afterwards. What is the whole body dose from each isotope the human receives over the first 1 day? Assume here that all the activity stays constant in the body over the day.

   2. b) One year after the incident, what is the dose over the year from the given ingested activity from each isotope? Assume tritium has 10 days and Caesium15 years of biological half-life time in the human body.

Answer 1