What elements are used in radioactivity?

Radioactive ElementsElementMost Stable IsotopeHalf-life of Most Stable IsotopePoloniumPo-209102 yearsAstatineAt-2108.1 hoursRadonRn-2223.82 daysFranciumFr-22322 minutes33 more rows•30 Jul 2019

What is the weakest type of radiation?

Alpha rays Alpha rays are the weakest and can be blocked by human skin and gamma rays are the strongest and only dense elements like lead can block them.

What is the most powerful radioactive element?

Polonium Polonium. Because it is a naturally-occurring element that releases a huge amount of energy, many sources cite polonium as the most radioactive element. Polonium is so radioactive it glows blue, which is caused by excitation of the gas particles by radiation.