Write a paragraph on the relative advantages and disadvantages of radioactive labels versus alternatives? Which would be most useful for different sequencing technologies? why?

Paper Instructions
1. Part 1: write a paragraph on the relative advantages and disadvantages of radioactive labels versus alternatives? Which would be most useful for different sequencing technologies? why?
2. Part 2: Find a journal article that compares different radionuclides for imaging. What is the take-home message? (provide reference)