Question

6. [5 marks] One of the dangers of a radioactive fallout from a nuclear bomb is $^{90}Sr$, which undergoes beta decay with a half-life of 29 years. Its chemical properties are similar to calcium so if $^{90}Sr$ is eaten by a cow, it ends up in the bones of whoever drinks the cow's milk. The energetic electrons from the beta decay will damage the bone marrow and impair the production of red blood cells. A particular nuclear bomb produces 400 g of $^{90}Sr$ when it explodes. If the fallout spreads uniformly over an area of 1000 $km^2$, what area (in $cm^2$) would have radioactivity equal to the allowed bone burden for one person of 0.002 mCi? The atomic mass of $^{90}Sr$ is 89.9 u. (1 Ci = $3.70 \times 10^{10}$ decays/s)

          6. [5 marks] One of the dangers of a radioactive fallout from a nuclear bomb is $^{90}Sr$,
which undergoes beta decay with a half-life of 29 years. Its chemical properties are
similar to calcium so if $^{90}Sr$ is eaten by a cow, it ends up in the bones of whoever
drinks the cow's milk. The energetic electrons from the beta decay will damage the
bone marrow and impair the production of red blood cells. A particular nuclear bomb
produces 400 g of $^{90}Sr$ when it explodes. If the fallout spreads uniformly over an area
of 1000 $km^2$, what area (in $cm^2$) would have radioactivity equal to the allowed bone
burden for one person of 0.002 mCi? The atomic mass of $^{90}Sr$ is 89.9 u.
(1 Ci = $3.70 \times 10^{10}$ decays/s)

6. [5 marks] One of the dangers of a radioactive fallout from a nuclear bomb is ^90Sr,
which undergoes beta decay with a half-life of 29 years. Its chemical properties are
similar to calcium so if ^90Sr is eaten by a cow, it ends up in the bones of whoever
drinks the cow's milk. The energetic electrons from the beta decay will damage the
bone marrow and impair the production of red blood cells. A particular nuclear bomb
produces 400 g of ^90Sr when it explodes. If the fallout spreads uniformly over an area
of 1000 km^2, what area (in cm^2) would have radioactivity equal to the allowed bone
burden for one person of 0.002 mCi? The atomic mass of ^90Sr is 89.9 u.
(1 Ci = 3.70 × 10^10 decays/s)

Added by Bradley W.

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