Positron Emission: An example of a positron emission ( + decay) is shown below. That positron is then very quickly annihilated by an electron, and this will emit two gamma rays that move in approximately opposite directions. Positive Beta Decay Positron Decay. In positron decay, a proton-rich nucleus emits a positron (positrons are antiparticles of electrons, and have the same mass as electrons but positive electric charge), and thereby reduces the nuclear charge by one unit. Uranium and thorium are examples of alpha decay. Positron emission or beta plus decay ( + decay) is a subtype of radioactive decay called beta decay, in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino ( e). Solution. Alpha decay is a type of radioactive decay in which a particle with two neutrons and two protons is ejected from the nucleus of a radioactive atom. Notes: The nuclide that decays is the one on the left-hand side of the equation. Positron emiss ion (\(^+\) decay) is the emission of a positron from the nucleus. When the radioactive molecule undergoes decay, it emits a positron through beta decay. Examples: 1. or antineutrino in the decay.. The order of the nuclides on the right-hand side can be in any order. An example of a positron decay equation: Some points to be made about the equation: 1) The nuclide that decays is the one on the left-hand side of the equation. The nucleus experiences a loss of proton but gains a neutron. Muon. Example of beta decay. A beta particle is typically a high speed electron in - decay or positron (an electron with a positive charge) in + decay. 2) The order of the nuclides on the right-hand side can be in any order. In this example, a neutron of carbon is converted into a proton and the emitted beta particle is an electron. Beta-Plus Decay: In beta plus decay, the proton disintegrates to yield a neutron causing a decrease in the atomic number of the radioactive sample. The lifetime of the muon is 2.20 microseconds. [1] These pairs can then be picked up with the machine and translated by the computer into an image. 3) The way it is written above is the usual way. Due to the change in the nucleus a beta particle is emitted. The muon is a lepton which decays to form an electron or positron.. The - decay of carbon-14. 2. If a nucleus emits a beta particle, it loses an electron (or positron). Examples of beta minus decay include the decay of \(^{14}C\) into \(^{14}N\) and it usually occurs in neutron rich nuclei. 1 1 p 0 1 n + +1 0 e. In positron decay mass number is conserved, however, number of protons decreases by one and number of neutrons increases by one. 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