Half Value Layer Attenuator Set
Gammex 115H

Determining the Half Value Layer (HVL) of the x-ray beam is the standard method for specifying the quality of the x-ray beam. For a given kVp, a measurement of the HVL gives information on the total filtration in the x-ray beam. Too little filtration results in unnecessary radiation to the patient. Too high of a HVL may require increased kVp and mAs, increasing tube loading and reducing tube life.

High purity aluminim (greater than 99.9%) has proven to provide more accruate measures of half value layer in mammography than aluminum alloys. In response to this, Gammex provides a set of five each 10 x 10 x 0.1 mm sheets of aluminum. Use the 115H for accurate mammographic HVL measurements and when performing MQSA compliance testing.

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