View the step-by-step solution to:


68F73F04-A3F3-4F97-A6EF-A231809E7D16.jpegPhysics (Nuclear)


26) Strontium-90, or Sr , which has a half-life of 28.9 years and neutral atomic mass 89.908 u, is an
especially dangerous radionuclide resulting from the fallout of a nuclear bomb. The danger arises
because "Sr is chemically similar to calcium, and if ingested by a cow, then ? Sr appears in the
cow's milk, and then in the bones of whoever drinks the milk. The beta particles emitted by 38 S
damage the bone marrow and reduce production of red blood cells.
a) The maximum "allowed" activity a person should be exposed to is 74,000 Bq. How many 38 S
atoms (nuclei) would cause this activity?
b) Suppose 400 grams of Sr is released in the explosion of a one-megaton bomb. How many 3: S
atoms is this?
c) Say the explosion spreads this 400 grams of Sr uniformly over a 2000 km area. How much
area, in cm , would contain the maximum number of atoms one person should be exposed to?
d) How does this area compare to the area of this sheet of paper, which is about 600 cm-?

Top Answer

Please see the attached... View the full answer


We are given -
Half-life of 38 5r = 28- 9 years
Atomic mass
= 89, 908 1
( a ) the maximum allowed activity a person should be
exposed to 74,000 Bg
We know that decay constant Is given by...

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question