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May 23, 2013

# Homework Help: chemistry

Posted by Shay on Wednesday, September 26, 2012 at 10:04am.

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?

• chemistry - Shay, Wednesday, September 26, 2012 at 1:15pm

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?

• chemistry - DrBob222, Wednesday, September 26, 2012 at 2:28pm

no intervals but here is how you do it.
k = 0.693/t1/2

ln(No/N) = kt
No = 280 mg
N = unknown
k from above
t = intervals in the problem (in hours).

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