‌1327‌Al+‌24‌He⟶‌1430‌Si+‌11H Bombardment of stable elements with high energy α-particles, protons, neutrons, deutrons or γ-rays produce radioactive nuclides. These radio-nuclides do not occur naturally and may be called man-made or artificial nuclides. The radioactivity exhibited by these artificial radio nuclides is referred to as artificial radioactivity.