Which of the following is NOT a property of x rays? 

Air within the glass envelope is referred to as a(an)___________and will eventually cause oxidation and burnout of the cathode filament.

Characterstics of tungsten as the target material include :    1. high atomic number   2. low melting  point   3. thermal conductor 

Prolonged heating of the x-ray tube filament when preparing for a radiographic exposure may lead to which of the following?     1. Electrical arcing     2. Premature filament breakage     3. Anode surface melting

  A backup timer for the AEC can serve to :   1.  protect the patient from overexposure   2  .prevent motion on the radiographic image  3.  protect the technologist from excessive exposure 

  A backup timer for the AEC can serve to :   1.  protect the patient from overexposure   2  .prevent motion on the radiographic image  3.  protect the technologist from excessive exposure 

Three phase six pulse rectification will have a ________% voltage drop. 

Anode angle will have an effect on the    1. severity of the heel effect    2, focal-spot size    3. heat-load capacity

The changing of alternating current to direct current is known as:

What is the formula for heat units for a single phase x-ray machine?