he isotope 81Thallium204 has a half-life of 3.78 years and canbe used as a nanotechnology MEMS (Micro Electric Mechanical System)power source device. It decays through beta emission into 82Pb204with a branching ratio of 97.1 percent with an average decay energyof 0.764 MeV. It also decays through electron capture to 80Hg204with a branching ratio of 2.9 percent with a decay energy of 0.347MeV.
Calculate the energy release per decay event in[MeV/disintegration]
Calculate its total specific activity in [Becquerels / gm].
Calculate its total specific activity in [Curies / gm].
Calculate the specific power generation in [Watts(th) / gm].
For a 100 Watts of thermal power in a Radioisotope Heating Unit(RHU) power generator, how many grams of 81Thallium204 areneeded?
After 3.78 years of operation, what would its power become?
Use: 1 MeV/sec=1.602x10-13 Watts, Av=0.602x1024 [nuclei/mole], 1Curie=3.7x1010 Bq.
