Astatine-219 has a half-life of 56 seconds and undergoes α decay 97% of the time and β- decay the other 3% of the time. A small sample of astatine-219 initially contains 20,000 atoms. a) Write the α decay reaction. _____________________________________________________ b) Write the β- decay reaction. _____________________________________________________ c) After 56 seconds have elapsed, how many atoms of each type (parent and daughters) are in the sample? _____________________________________________________________________________ d) After four half-lives have passed, how many astatine ato
Astatine-219 has a half-life of 56 seconds and undergoes α decay 97% of the time and β- decay the other 3% of the time. A small sample of astatine-219 initially contains 20,000 atoms. a) Write the α decay reaction. _____________________________________________________ b) Write the β- decay reaction. _____________________________________________________ c) After 56 seconds have elapsed, how many atoms of each type (parent and daughters) are in the sample? _____________________________________________________________________________ d) After four half-lives have passed, how many astatine atoms remain in the sample? ________________________ e) What is the initial activity of the sample? ________________________ f) What will be the activity of the sample after three minutes? ________________________ g) How long will it take for there to be only 7903 astatine atoms remaining in the sample? __________
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