Alpha decay (two protons and two neutrons) changes the mass number of the element by -4 and the atomic number by -2 so the remaining nucleus will be \(_{90}^{234}?\). A periodic table shows that ...

Gamma close gamma radiationA type of ionising radiation that is also part of the EM spectrum. It has no mass. is pure energy and will not change the structure of the nucleus in any way.

Radionuclides of natural origin contained in or released from process materials may pose a risk to workers, public or the environment. These radioactive elements in minerals and ores originally found ...