In most X-ray tubes __________________ is used as an exit port for the X-radiation energy. Boron Tungsten Molybdenum Beryllium.
Most of the energy used in producing X-rays converts to: Photon fields Heat X-ray production A phenomenon known as leakage fields.
The structure known as the cathode serves as the
______________ source. Proton Neutron Electron Photon.
Increasing _________________ across the filament expends
more free electrons, thereby increasing the number of free
electrons able to cross and strike the anode target creating more X-
radiation. Alternating current Direct current Kilovoltage milliamperes.
X-radiation is produced when a supply of: High-speed electrons are introduced from the cathode and strike the anode within a vacuum-sealed envelope. High-speed electrons are introduced from the anode and strike the cathode within a vacuum-sealed envelope. High-speed protons are introduced from the cathode and strike the anode within a vacuum-sealed envelope. High-speed protons are introduced from the anode and strike the cathode within a vacuum-sealed envelope.
The high-vacuum envelope is used to: Prevent oxidation of components contained within the tube. Reduce the problems of electrons colliding with, and being
absorbed by, molecules of air. Act as an electrical insulator between the cathode and anode. All of the Above.
In most cases, the standard anode material is: Beryllium Lead Tungsten Titanium.
Van de Graaff generators obtain their electrons through: Electrostatic principle. Accelerated electrons within an annular tube Multiple straight alternating segments from cathode to anode. Combination of all the above.
The maximum radiation intensity level at the surface of a package with a Radioactive Yellow III shipping label is: 1 mR/hr 10 mR/hr 50 mR/hr 200 mR/hr.
In accordance with DOT regulations, radioactive materials are classified into which two categories? Hazardous and non-hazardous Normal and Special form Penetrating and non-penetrating Type I and Type II.
Radiation arising directly from the target of an X-ray tube or an accelerator, or from a radioactive source, is usually referred to as: Secondary Primary Radiation Backscatter Inherent Radiation.
A radiographer was exposed to a dose rate of 100 mR/hr for 30 minutes. What was his dose? 100 milliroentgens 100 mrem 500 mrem 50 mrem.
A storage vault cannot have more than which of the following readings at any external surface? 2 mR/hr 10 mR/hr 20 mR/hr 200 mR/hr.
The parts of the Louisiana Administrative Code that pertain directly to radiographic personnel are chapters: 2, 3, & 4 4, 5, & 10 6, 9, & 10 10, 11, & 12.
The output equivalent to curies with an X-ray tube is controlled by the: power switch Voltage rheostat amperage rheostat On/Off switch.
An X-ray cabinet must comply with unrestricted area requirements. The maximum amount of radiation emitted from the cabinet at 1.97 inches shall not exceed: 1 mR/hr 2 mR/hr 5 mR/hr 0.5 mR/hr.
At the completion of an X-ray exposure and turning the system to standby: you must wait for 60 seconds before approaching the tube head you should approach the rear of the tube head observing the
meter constantly you may approach the tube head immediately without fear of
exposure you must survey the tube assembly 360 degrees.
A person is standing in an area where they are exposed to 25 mrem during a 40 second shot with a tube setting of 10 mA. If the milliamperage were changed to 5 mA with the same exposure time, what would the person’s new exposure be? 10 mrem 12.5 mrem 35 mrem 50 mrem.
Electrons are accelerated in a betatron by applying: An electrostatic field A magnetic field More voltage to the anode More amperage to the cathode.
Which of the following tubes consists of a series of cylinders of increasing lengths stretching from the cathode to the anode with a gap between each cylinder? Van de Graaff generator Betatron Linear Accelerator None of the Above.
An electromagnetic device which is used to change a particular alternating voltage to either a higher or lower value is known as a(n): X-ray tube Betatron Transformer Generator.
Units that operate by charging a capacitor to the desired kilovoltage and then discharging this electrical energy across the tube from the cathode (field emitters) to the anode are known as: Betatrons Linear Accelerators Van deGraaff Generators Pulse X-ray Tubes.
What requirements must the area outside of a permanent radiographic installation meet? Unrestricted Area Requirements Restricted Area Requirements Radiation Area Requirements High Radiation Area Requirements.
High radiation area control devices (interlocks, lights, area monitors, etc.) must be tested for proper operation how often? Daily Weekly Monthly At the beginning of each period of use.
How many safety interlocks must doors have on cabinet x-ray systems? One Two Three None.
Which of the following is not required when operating a certified cabinet x-ray system that is designed to exclude personnel? Safety interlocks Film badge or TLD Direct Reading Pocket Dosimeter Visible Indicator Alarms.
Which of the following signs must be posted on all doors and access panels of a cabinet x-ray system that excludes personnel entry? Radiation Area Restricted Area Either High or Very High Radiation Area None of the Above.
When the operator is not present, which of the following must be removed in order to render the equipment inoperable? Safety Interlocks Key Energy Supply Cable Safety Bypass.
What is the term used for the scattering of radiation when it interacts with the air and/or materials above the permanent installation? Sky Shine Moon Shine Atmospheric Scattering Backscatter.
How often should radiation surveys be performed to ensure that proper radiation levels are being observed? Upon installation of the equipment, and at least every 12
months thereafter Any time a visual inspection of a local component reveals an
abnormal condition Whenever personnel monitoring devices show a significant
increase over the previous monitoring period or the readings
are approaching the specified limits. All of the above.
Which of the following warning devices are required on open beam configuration x-ray tubes? X-ray tube “on-off” status located near the radiation source
housing A warning light labeled with the words “X-ray On” near any
switch that energizes an x-ray tube Shutter “open-closed” status located near each port on the
radiation source housing All of the Above.
Which of the following survey instruments can be used with pulsed (or flash) X-ray units? Geiger-Muller Type Meters Scintillation Type Meters Ionization Gage Type Meters None of the Above.
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