# Decay and couriers!

1. Oct 18, 2011

### shamone

In a reactor and sepertation plant complex, nuclide A is produced in pure form, without any contamination by nuclide B.

A has a half life of 23minutes and B has a half life of 23days. A is a beta only emitter whereas B is a beta and gamma emitter. If A has been purified in a reatcor and 11.5minutes of purification it emmits 1000gamma rays per second and when delivered it also emits 1000gamma rays per seconf, how long did the delivery take?

Secondly if this was delivered to you by a courier company would you use them again?

I have used n(t) =No*lambday/(lambay-lambdax) * (e-lambdax*t - e-lambday8t)

So guessing this is something about activity, but can't quite get it. think the answer is 40.7days but not sure how to come to this

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How does this affect the problem... the 11.5minutes.

A is a beta only emitter whereas B is a beta and gamma emitter. If A has been purified in a reatcor and 11.5minutes of purification it emmits 1000gamma rays per second and when delivered it also emits 1000gamma rays per seconf, how long did the delivery take?

Last edited: Oct 18, 2011
2. Oct 18, 2011

### daveb

Your statements are a little confusing. If the activity is 1000Bq, then delivered, and it's still 1000Bq, then statistically no time has passed for the delivery. Can you restate the problem in its entirety?

3. Oct 18, 2011

### shamone

That is the problem in it's entirity...

4. Oct 23, 2011

### shamone

Anyone have any ideas?