Polonium-210 is aradioactive isotope that is suspected to be involved in the poisoningof former Russian KGB officer AlexanderLitvinenko in the UK in November2006.This isotope emits highly ionizing alpha-particles with a kineticenergy of 5.3 MeV in its decay to lead-206.

a) IfLitvinenko ingested an amount of Polonium with an activity of 2 giga-Bequerel,what dose in kilo-Gray was absorbed in 20 days, assuming that all of the energywasdeposited into 100 g of tissue? The half-life of Polonium is 138 days andis long enough to be ignored. An energy of 1 MeV is equivalent to 1.6E-13 J.

b) What wasthe equivalent dose absorbed in mega-Sv?