Question

Ruthenium-106 (106Ru) is used to treat melanoma in the eye. This isotope decays by B- emission with a half-life of 373.59 days. One source of the isotope is reprocessed nuclear reactor fuel. How many protons and how many neutrons does the 106Ru nucleus contain? protons: neutrons: Identify the missing daughter nucleus in the B- emission decay of 106Ru. 106Ru - ?? + e + Te How many years after 106Ru is implanted in the eye does it take for its decay rate (or activity) to be reduced to 27.5% of the initial decay rate? Use 1 year = 365 days. time: years

Answer 1

capacitance plate radius (8) = 1cm Ruthenium-106 ² Atomic number = 44 1) Number of proton 44 62 2) Number of 106-44 neutron = 3) 106 106 Ru te tre Ru Yrs. 4) Half life Tula 373.59 365 days 373.59 A. Initial activity activity Final Ao x 27.5 A (+) If required time in t then tlar A(+) Ao 6) xftir (+)* A.X 27.5 A, X100 27.5 100 Taking log on both side "Iya Cyr log (2²) loy 275) log (2705) log (12) t = 373.59 365 X 1.906 Years