Se-75

Arsenic-71 (As-71) is a radioactive isotope of arsenic with a half-life of approximately 65.3 hours (2.72 days). It decays by electron capture and positron emission to stable germanium-71. Its decay produces characteristic gamma rays, including a prominent line at approximately 175 keV, making As-71 detectable by gamma spectroscopy.

As-71 is primarily used in nuclear medicine and radiochemistry research. It has been investigated as a positron-emitting radionuclide for PET imaging and as a radioactive tracer for studying arsenic-containing compounds. Its relatively long half-life allows researchers to investigate biological processes that occur over several days.

As-71 does not occur naturally in significant quantities and is produced artificially using particle accelerators. It can be generated through nuclear reactions involving germanium targets, followed by chemical separation and purification. As-71 is mainly encountered in research laboratories, medical isotope-production facilities, and experimental radiopharmaceutical applications.

As-71

Arsenic-71
Technogenic β, γ radiation

Half-life: 2.72 days Main emission lines: 175, 511 keV