The reaction is:
Po-216----------------alpha particle-----------------Pb-212
Npn decays to Pan-4 and alpha. Only isotopes 234, 235, and 237 of neptunium can undergo alpha decay, the others decay by beta-, beta+, K capture, and/or gamma decay. So the only products of neptunium alpha decay can be protactinium isotopes 230, 231, or 233.
Lead-208 is formed by alpha decay (emission of alpha particles) from polonium-212.
Americium-241 has an alpha decay associated with gamma.
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The daughter isotope of Pu-239 is U-235.
All isotopes of polonium can undergo alpha decay, a small number of isotopes can also undergo beta decay, K capture decay, or gamma decay.
when an isotope is it does not undergo radioactive decay
The decay of 212Po84 goes like that:212Po84 ----- 4a2 + 208Pb82The lead isotope that forms, 208, is stable.
By alpha decay polonium-214 is transformed in lead-210. Po-214--------------alpha--------------Pb-210
Polonium 212 has 84 protons and 128 neutrons. An alpha particle is 2 protons and 2 neutrons, so the daughter nucleus will have 82 protons and 126 neutrons, making it lead 208.
The isotope radon-198 will alpha decay to polonium-194 as shown here: 86198Rn => 24He + 84194Po The radon is shown on the left, and the alpha particle, which is a helium nucleus, is shown of the right with the polonium.
In the case of Rn-222, which is the "isotope of concern" because it occurs naturally, it decays as follows: 222Rn => 218Po + He+2 In this equation, we see the radon isotope Rn-222 emit an alpha particle (the helium nucleus) and undergo a transformation to become the polonium isotope, Po-218.
Each isotope has a specific radioactive decay.
Radon-222 undergoes alpha decay to produce polonium-218as a daughter.
Npn decays to Pan-4 and alpha. Only isotopes 234, 235, and 237 of neptunium can undergo alpha decay, the others decay by beta-, beta+, K capture, and/or gamma decay. So the only products of neptunium alpha decay can be protactinium isotopes 230, 231, or 233.
Polonium-218-------------alpha---------------Lead-214
It is alpha decay. In the process, an alpha particle(He2+) is released. So, it is called alpha decay.