(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Plutonium-238 with a half-life of 90 years, emits and alpha particle of energy 5.10 MeV. 180mg of this radioisotope is used to power a pacemaker. Calculate the initial power in mW, supplied by Plutonium-238, assuming a 100% efficiency for the conversion of decay energy into usable power.

2. Relevant equations

I tried using:

N = N_{o}(1/2)^(t/T), where T is the half-life

P = W/t

3. The attempt at a solution

I do not know what "time" to use in order to calculate the power. What does it mean by "initial"?

Help would be very appreciated.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Radioactive decay and power

**Physics Forums | Science Articles, Homework Help, Discussion**