The daughter isotope of Pu-239 is U-235.
The first step is an alpha decay to (guess what!) uranium 235. You can probably take it from there.
Uranium-239 does NOT decay by alpha decay, it decays only by beta and gammadecay.
For example americium-241 decay to neptunium-237 and americium-243 decay to neptunium-239.
I'm pretty sure its alpha.
The alpha decay of americium-241 produce neptunium-237.
plutonium-239
Yes, plutonium-239 emits alpha particles by decay.
The first step is an alpha decay to (guess what!) uranium 235. You can probably take it from there.
Uranium-239 does NOT decay by alpha decay, it decays only by beta and gammadecay.
Plutonium 239 emit: alpha, gamma, spontaneous fission neutrons Uranium 235 emit: alpha, gamma, spontaneous fission neutrons
The reaction is:Pu-239 + alpha = Cm-242 + n
Each isotope of plutonium has its own decay scheme. Plutonium-239 is the most widely used isotope, and it undergoes alpha decay into uranium-235 with a half-life of 2.41 x 104 years (24,100 years). A link is provided to the Wikipedia article on plutonium.
The most common isotope of plutonium is Pu-239. Ejecting four protons and four neutrons would reduce the atomic number from 94 to 90 and the mass number from 239 to 231. Element #90 is Thorium, so the answer would be Thorium-231. However, that is not an actual decay mode for Pu-239. Pu-239 decays by emitting an alpha particle (two protons and two neutrons) to Uranium-235. U-235 can then further decay by emitting another alpha particle to form Th-231.
I suppose that the isotope formed is Am-245.
Americium-243 might undergo alpha decay to become neptunium-239, and here is that equation: 95243Am => 93239Np + 24He++ The americium-243 has undergone transmutation to become neptunium-239, and the alpha particle, which is a helium-4 nucleus, can be seen on the tail end of the equation.
PlutOnium 239 is an element - plutOnium - with an atomic weight of 239.
Isotopes of plutonium emit different types of radiation. For the most common isotope, plutonium-239: alpha particles and neutrons from spontaneous fission.