User:LaundryPizza03/Isotopes of bromine

Bromine-75
Bromine-75 has a half-life of 97 minutes. This isotope undergoes β+ decay rather than electron capture about 76% of the time, so it was used for diagnosis and positron emission tomography (PET) in the 1980s. However, its decay product, selenium-75, produces secondary radioactivity with a longer half-life of 120.4 days.

Bromine-76
Bromine-76 has a half-life of 16.2 hours. While its decay is more energetic than 75Br and has lower yield of positrons (about 57% of decays), bromine-76 has been preferred in PET applications since the 1980s because of its longer half-life and easier synthesis, and because its decay product, 76Se, is not radioactive.

Bromine-77
Bromine-77 is the most stable radioisotope of bromine, with a half-life of 57 hours. Although β+ decay is possible for this isotope, about 99.3% of decays are by electron capture. Despite its complex emission spectrum, featuring strong gamma-ray emissions at 239, 297, 521, and 579 keV, 77Br was used in SPECT imaging in the 1970s, but except for longer-term tracing, this is no longer considered practical due to the difficult collimator requirements and the proximity of the 521 keV line to the 511&bsp;keV annihilation radiation related to the β+ decay. However, the auger electrons emitted during decay are well-suited for radiotherapy, and it can possibly be paired with the imaging-suited 76Br (produced as an impurity in common synthesis routes) for this application.