Radiation Protection Glossary

A radiation protection glossary for Radiation Protection Supervisors (RPS) and anyone interesting in radiation safety terminology. The glossary is a mixture of health physics terms, and phrases related to radiation legislation, transport, practical safety and similar.

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Half-Life (Biological)

The biological half-life is the time taken for half of a radioactive material, (present in a body as a result of inhalation, ingestion, injection or absorption), to be eliminated by the biological processes in that body. For example, Tritium contaminated ingested water will tend to clear quickly (quicker still if the individual drinks plenty of water), whereas Ca-45 will tend to bind to bone. The solubility of the radioactive substance will also effect retention time in the body.

A man who dares to waste one hour of time has not discovered the value of life

– Charles Darwin