Ac227

Ac-227, or actinium-227, is a radioactive isotope of the element actinium (atomic number 89) with a mass number of 227. It has a half-life of about 21.8 years. Its decay is by beta minus emission to thorium-227, which subsequently decays by alpha emission to radium-223, continuing through a decay chain to stable lead. Ac-227 also emits gamma radiation as part of its decay scheme, which aids in detection and spectroscopy.

Occurrence and production: In nature, Ac-227 occurs only in trace amounts within uranium-235 and thorium decay series. It is typically produced in nuclear processes, notably from the decay of protactinium-231, and can be isolated by radiochemical separation from other actinides in specialized facilities. Its long half-life makes it a persistent but low-concentration nuclide in certain ore and reactor contexts.

Physical and chemical properties: As an actinide, Ac-227 is chemically similar to other trivalent actinides in many environments, but its radioactivity requires stringent containment and handling. It forms a variety of inorganic and organic complexes characteristic of actinium chemistry, and its radiolysis and decay products influence its chemical behavior over time.

Applications and handling: Ac-227 has mainly historical and niche research significance in radiochemistry and nuclear science. It is less commonly used in practical applications compared with other actinide isotopes such as 225Ac or 223Ra, which have more established medical or industrial roles. Safety considerations are paramount due to its alpha and gamma emissions.

Safety: Ac-227 is highly radioactive; exposure risks arise from ingestion, inhalation, or close contact. Handling requires licensed facilities, appropriate shielding, containment, and monitoring to protect personnel and the environment.