half thickness


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half thickness

[′haf ¦thik·nəs]
(physics)
The thickness of a sheet of material which reduces the intensity of a beam of radiation passing through it to one-half its initial value. Also known as half-value layer; half-value thickness.
References in periodicals archive ?
The procedure begins with a reasonable initial guess of the surface which is simply assumed to be a semicircle with a half thickness radius.
Because gas is normally injected into part sections with a half thickness greater than 3 mm, primary gas penetration is so rapid that most of the heat exchange between the melt and the gas occurs during secondary gas penetration, i.