# Radioactive Decay as a Power Source

Strontium-90 is to be used in a radioisotopic thermoelectric generator (RTG) for powering a navigation beacon located in the arctic.

a) How much of the Sr-90 activity is required to generate 50 W of electric power if the conversion efficiency from heat to electricity is 30%? Tip: You must take into account the fact that Sr-90 is in equilibrium with its daughter, Y-90.

b) What is the mass of Sr-90 required?

c) Weight is an important factor in the design of a portable, isotopic heat source. If weight is to be kept at a minimum and if the source is to generate 50 W after 1 year of operation, would there be an advantage to using Po-210 compared to Sr-90?

https://brainmass.com/physics/power/radioactive-decay-power-source-32795

#### Solution Preview

Electricity to be generated = 50 W

But the efficiency of conversion of heat to electricty is only 30 %.

So heat Required * 0.3 = Electricty Required

Therefore Heat ...

#### Solution Summary

This solution includes steps, explanation and answers. The solution is 120 words.