I hope someone can help me with this. I have programmers working on something for work, and I need to check their work. I know how to calculate the radioactive isotope decay rate, but I hoping someone can help me program it into my calculator so I can solve for faster. I have 48gx and 35s, 15c, and 28C that I can use. I prefer not use 28c because I have not fixed battery problem yet and I do not feel like losing program after I power it off.

I define formulas for you, but first let me define variables:

Ai = initial activity/radioactivity of isotope

t = elapsed time (hours)

A = current radioactivity (what we solve for)

H = half-life of radioisotope (hours)

Formulas:

A = Ai(1/2)^t/H

t = (H ln (A/Ai))/(ln (1/2)) <<- ln be natural logarithm

I sorry if this overly complicated, as I can do manually, but I would like to program and I am not sure how.