Config File Question

[VenomCell]

Hello, I've made an inline RTG and I'd like to have different radioactive materials that have different power outputs along with different life spans. I'm not sure how to do the life span part, if it's even possible. 

For example you could select Americium-241 that lasts like 400 years but has very little output, or Strontium-90 that has higher output and lasts 25 years... Is there a way to do this? Thanks!

[Randazzo]

With stock mechanics you would have to create a resource for the generator to consume and set the rate to correspond to the time you'd like it to last I suppose.