Calculus help?

Question

Calculus help?

thecalchater · Answer

5.	Find the limit of your model. How long will it take for the material to become “safe”? “Safe” means that the radiation coming from the material is no longer a danger to public health. 

This is my model y = 10e^-.000028761t

thecalchater · Answer

@welshfella  @freckles

freckles · Answer

when is it no longer a danger?
how much radiation is allowed? :p

thecalchater · Answer

I have 10 grams and I figured out how long it takes for it to reduce to 1 gram...

thecalchater · Answer

I'm working with plutonium 239

welshfella · Answer

yes   thats the million dollar question.  - what mass of plutonium is safe??

welshfella · Answer

I think that's pretty toxic!!!

thecalchater · Answer

http://ieer.org/resource/factsheets/plutonium-factsheet/ 5.244??

thecalchater · Answer

http://www.world-nuclear.org/information-library/nuclear-fuel-cycle/fuel-recycling/plutonium.aspx

welshfella · Answer

I read that this is very dangerous up to 20 times its half life.

thecalchater · Answer

So what would I say then? or how would I solve it?

thecalchater · Answer

Or could I list it as it is unknown it is still dangerous after 400,000 years?

welshfella · Answer

well that's what i would do.  I dont see how we can guess an arbritary mass which is safe.

thecalchater · Answer

@phi ??????????????

thecalchater · Answer

which link did u read that on?

welshfella · Answer

http://www.livescience.com/33127-plutonium-more-dangerous-uranium.html

welshfella · Answer

half a million years!

thecalchater · Answer

k thanks. I'll have phi take a look and see if he can figure this out... for now I'm gonna go with over 500,000 years.

welshfella · Answer

yea  sounds good