Denia Strontium-90 is a radioactive byproduct of nuclear reactors (and nuclear weapons) biologically much like calcium (also in Group II on the periodic table). Consequentially, it can accumulate in the milk of mammals and then into the bone when ingested. This is a particular concern when children ingest milk in significant amounts that has been contaminated by 90Sr. The public first became aware of this potential threat decades ago when the United States was involved in atmospheric atomic bomb testing; one of the major concerns about health impacts of nuclear tests regarded public exposure related to the intake of 90Sr in contaminated milk. By what type of nuclear process (reaction) is it formed from U-235? First, write a reaction showing this, assuming that the reaction was initiated by an energetic neutron colliding with the uranium nucleus and resulted in the formation of a Sr-90 nuclide plus three additional neutrons, plus some other product (see fig). Next, write two reactions: both for Sr-90 decay AND of the decay of its daughter. 7% U-233 5% 3% 1% 90 100 89 90 Pu-239 130 140 65%U 35%Pu 130 120 U-235 6% 4% 2% 158 160
Denia Strontium-90 is a radioactive byproduct of nuclear reactors (and nuclear weapons) biologically much like calcium (also in Group II on the periodic table). Consequentially, it can accumulate in the milk of mammals and then into the bone when ingested. This is a particular concern when children ingest milk in significant amounts that has been contaminated by 90Sr. The public first became aware of this potential threat decades ago when the United States was involved in atmospheric atomic bomb testing; one of the major concerns about health impacts of nuclear tests regarded public exposure related to the intake of 90Sr in contaminated milk. By what type of nuclear process (reaction) is it formed from U-235? First, write a reaction showing this, assuming that the reaction was initiated by an energetic neutron colliding with the uranium nucleus and resulted in the formation of a Sr-90 nuclide plus three additional neutrons, plus some other product (see fig). Next, write two reactions: both for Sr-90 decay AND of the decay of its daughter. 7% U-233 5% 3% 1% 90 100 89 90 Pu-239 130 140 65%U 35%Pu 130 120 U-235 6% 4% 2% 158 160
Chapter20: The Representative Elements
Section: Chapter Questions
Problem 70E
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Transcribed Image Text:Strontium-90 is a radioactive byproduct of nuclear reactors (and nuclear weapons) that behaves
biologically much like calcium (also in Group II on the periodic table). Consequentially, it can
accumulate in the milk of mammals and
then into the bone when ingested. This is
a particular concern when children ingest
milk in significant amounts that has been
contaminated by 90Sr. The public first
became aware of this potential threat
decades ago when the United States
was involved in atmospheric atomic
bomb testing; one of the major concerns
about health impacts of nuclear tests
regarded public exposure related to the
intake of 90Sr in contaminated milk. By
what type of nuclear process (reaction) is
it formed from U-235? First, write a
reaction showing this, assuming that the
reaction was initiated by an energetic
neutron colliding with the uranium nucleus and resulted in the formation of a Sr-90 nuclide plus
three additional neutrons, plus some other product (see fig). Next, write two reactions: both for
Sr-90 decay. AND of the decay of its daughter.
90 100
130 140
7%
U-233
Pu-239
65%U
5%
35%Pu
M
3%
90
10120
1%
89
U-235
6%
4%
2%
150 160
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