What elements undergo positron decay?

Mar 22, 2015

Positron emission or beta plus decay (β+ decay) is a particular type of radioactive decay and a subtype of beta decay, in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino (νe).[1] Positron emission is mediated by the weak force. The positron is a type of beta particle (β+), the other beta particle being the electron (β−) emitted from the β− decay of a nucleus.

Okay coming to the point

Isotopes which undergo this decay and thereby emit positrons $\to$carbon-11
$\to$potassium-40,
$\to$nitrogen-13,
$\to$ oxygen-15,
$\to$aluminium-26,
$\to$ sodium-22,
$\to$ fluorine-18,
$\to$ iodine-121.