saftey
What are the 4 requirements for production of X-rays?
1. source of free electrons
2. acceleration of electrons
3. focusing of electrons
4. deceleration of electrons.
How are X-rays produced during electron acceleration?
high-speed electrons bombard the target area (anode).
What materials are typically used to make the focusing cup?
Molybdenum (nickel)
What percentage of energy is converted to heat during deceleration of electrons?
99% heat
why is tungsten used for the anode target?
1. high melting point
2. high atomic number (74)
3. good thermal conductor.
What is Thermionic Emission?
heating of the filament to the point that electrons boil off its surface.
The Anode is a ______electrode, and carries a _______charge?
1. positive electrode (+)
2. Positive charge.
The cathode is a ________electrode, and carries a ________charge?
1. Negative electrode (-)
2. Negative charge.
what percent of energy is converted to x-rays when decelerating electrons?
1% x-ray
What is:
smallest subdivision of an element that maintains all the physical and chemical properties of the element.
Atom.
What determines the amount of current that will be sent to the filament?
mA settings.
What is the Anode made of?
Tungsten with Rhenium.
What are the two main components of the Cathode?
1. Filament wires
2. focusing cup
What type of energy is heat?
Thermal energy
what does the nucleus contain?
positively charged protons, and neutral neutrons.
Where does Current come from?
The step-down Transformer.
What is the Unit of electric potential?
Volt or Voltage.
What material makes up the filament wires?
thoriated tungsten with thorium.
what type of energy are x-rays?
Electromagnetic energy
What does the atomic number "Z" represent?
the number protons in the nucleus
What causes acceleration of electrons in the x-ray tube?
A high electrical potential applied to the cathode end of the x-ray tube.
What is the function of the focusing cup?
surrounds the filament, directs electrons into a concentrated stream toward the anode.
What happens during deceleration of electrons?
high speed electrons strike the tungsten target of the anode.
where is the site of x-ray photon conversion?
the anode.
What does atomic mass "A" represent?
the sum of protons and neutrons in the nucleus.