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half-value layer |
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half-value layer (HVL), the amount of absorbing material required to attenuate a beam of radiation to half its original level. Quantities are indicated by length, as millimeters of aluminum or centimeters of soft tissue. half-value layer (HVL), n the thickness of a specified material (usually aluminum, copper, or lead) required to decrease the dosage rate of a beam of radiograph at a point of interest to half its initial value. A determination of the half-value layer of a given radiographic beam is used to denote the quality of the radiographic beam. The half-value layer will vary depending on kilovolt peak and the amount of filtration at the source. half-value layer the thickness of a given substance which, when introduced in the path of a given beam of rays, will reduce its intensity by a half. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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