Alpha Beta Hydrogens

SCIENCE HELP REALLY EASY?
There are six sample radioisotopes listed. Assuming that you had equal masses of each substance, which would you pose the greatest threat in your health?
Radioactive Isotope Type of Decay Half Life
Hydrogen-3 (tritium) Beta 12.3 yrs
Carbon -14 Beta 5730yrs
Francium-221 Alpha 4.8 mins
Polonium-210 Alpha 140 days
Potassium-40 Beta 1,280,000,000 yrs
Radon-222 Alpha 3.82 days
Thanks for your help
Radon is poison to humans and causes cancer.
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Categories: Hydrogen