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The following is a part of the uranium decay series U^283 92 =Th^234 90= Po^234...

The following is a part of the uranium decay series U^283 92 =Th^234 90= Po^234 91 =X
1) What particles are emitted in each of the first two stages?
2) if a beta particle is emitted in stage three, indicate the isotope X
3) if the activity of Th^234 90 is reduced to 75% in 48 days, what is the half life of Th^234 90?

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