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For Primary Radiation,what Is the Term That Represents a Portion

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For primary radiation,what is the term that represents a portion of beam-on time that the x-ray beam is directed at a primary barrier during the week?


Definitions:

Heart Sound

Sounds produced by the closing of heart valves during the cardiac cycle; typically described as a "lub-dub" sound.

Heart Murmur

An unusual or abnormal sound heard between heartbeats, which can be innocent or indicate a heart problem.

Extra Heart Beat

An additional heartbeat that occurs outside of the normal rhythm, also known as premature contraction.

End-Systolic Volume

The volume of blood in the ventricle of the heart immediately after contraction, before the heart fills again.

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