An experiment was performed at the JINR research centre in Russia with the aim of producing element 117. The experiment involved the bombardment of a 249 Bk target with 48 Ca. The amount of target material amounted to 20 mg and the half-life of 249Bk is 320 days. (i) Calculate the activity of the target. (ii) The isotope 249Bk decays almost entirely by beta decay, but also has a small alpha decay branch of 1.4 × 10-3 % and a spontaneous fission branch of 4.7 × 10-8 %. Calculate the partial half-lives for alpha decay and spontaneous fission, respectively.
An experiment was performed at the JINR research centre in Russia with the aim of producing element 117. The experiment involved the bombardment of a 249 Bk target with 48 Ca. The amount of target material amounted to 20 mg and the half-life of 249Bk is 320 days. (i) Calculate the activity of the target. (ii) The isotope 249Bk decays almost entirely by beta decay, but also has a small alpha decay branch of 1.4 × 10-3 % and a spontaneous fission branch of 4.7 × 10-8 %. Calculate the partial half-lives for alpha decay and spontaneous fission, respectively.
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Transcribed Image Text:An experiment was performed at the JINR research centre in Russia with the aim of
producing element 117. The experiment involved the bombardment of a 249 Bk target
with 48 Ca. The amount of target material amounted to 20 mg and the half-life of 249Bk
is 320 days. (i) Calculate the activity of the target. (ii) The isotope 249Bk decays
almost entirely by beta decay, but also has a small alpha decay branch of 1.4 × 10-3
% and a spontaneous fission branch of 4.7 × 10-8 %. Calculate the partial half-lives
for alpha decay and spontaneous fission, respectively.
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