Radiation Protection Glossary

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

Search the Glossary by either clicking on a letter or typing a keyword into the search box. This glossary is relational so when looking at one term you can click through to other related terms as required.

HVT - Half Value Thickness

Simply stated, the HVT is the thickness of a radiation shield that will reduce radiation gamma / x-ray dose rate (or dose) to 1/2 of the of the pre-shielded value. There are a number of factors that will potentially interfere with this approach, but HVT is still a good approximation in many cases.

HVT is related to TVT by the expression 3.32 HVT = 1 TVT. Head over to the TVT resource for a fuller explanation of this concept.

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