Khan

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6 Terms

1
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To what energy is the Roentgen defined?

3 Mev

2
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What is the most common type of electrometer?

negative feedback operational amplifier

3
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What is a Thoraeus filter used for? How is it contstructed?

A combination filter used in orthovoltage kV beams. Designed to increase the effective HVL without reducing beam intensity.

Tin, Cu, Al.. Ordered highest Z facing x-ray tube (Tin, Sn), and lowest facing patient (Aluminum)

4
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What is homogeneity coefficient?

HVL1 / HVL2

5
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How can kV beams be measured directly? Indirectly?

Directly: Voltage divider, sphere gap method

indirectly: fluorescence, attenuation, penetrameter (e.g. Adrian-Crooks cassette)

6
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How can MV beams be measured directly? Indirectly?

Directly: Scintillation spectrometry, Photoactivation foils

Indirectly: Compare measured PDD (MOST COMMON)