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In radiography we use two basic units
Milliamps and kilovolts
In radiography what does 1 rad equal
What type of charge does an electon have
What type of charge does a proton have
What type of charge does a neutrons have
No charge, or neutral
What holds the mass of an atom
What makes up a neutral atom
Having the same number of electons, protons and neutons.
Different number of neutrons and Protons
Atomic numbers tell you?
How many protons and electons
where can the atomic number be found on the periodic table?
It is the top number
The weight of an atom can be found where on the periodic table
It is the bottom number
when moving K-Q through shells what tends to happen
There is less energy
Electrons exist only in
The further you get away from the nucleus, the more or less energy the electron has
The more complex an atom is, the higher or lower the electron binding energy is for the electron
How is Ionization produced
Through adding or removing the orbital electron
What two types of ionizing radiation are considered particulate radiation
Alpha and beta
What two types of ionizing radiation are electonmagnetic (EM) Radiation?
Xray and Gamma Ray
Xray and Gamma Rays are called
Em radiation travels at the speed of
Light or not at all
What is a small bundle of energy called
What holds the properties of:
Highly penetrating invisible rays
Liberate minute amounts of heat passing through matter
Causes a chemical and biological change
What is the velocity of an electromagnetic photon?
The speed of light
What is known as phonton that are continuously in motion
What is amplitude
it is the 1/2 the range from crest to valley over which the sine wave varies
What is Frequency
The rise and fal of the sine wave
What is wavelength
it is the distance fro one crest to another, or one valley to another
When the frequency is increased, what happens to the wavelength
Photon energy is deirectly proportional to
the photon frequency
When the photon has high frequency, it equals higher energy. What does this mean for the x-ray
It is considered a Hard X-ray and is more penetratings
Longer wavelength equals a lower energy, what does this mean for the x-ray
Soft X-ray, less penetrating. It will not reach the film
When electromagnetic radiation is emitted for a source, the intensity
Decreases rapidly with the distance from the source
What is the Inverse square Law
- intensity 1 = distance 22intensity2 distance1 2
A worker receives an exposure of 90 mR per week at a distance of 100 cm. from a radiation source. What will the new weekly exposure be if a worker were able to move to a 300 cm distance?
- Seperate your distance and your MR, and cross place. So your 90 Mr @ a distance of 100 cm would be crossed from one and other while the xmr and 300 would be crossed.
- 90 mr = 300x 100
- Now remember everytime you are looking for distance, distance is always squared so now the problem looks like:
- 90 mr=90000x =10000
Now cross multiple. So you would multiple your 90mr X 10,000 and the x X 90000.
Resulting in 90000x =900000
Now in order to get the factor of the X, you need to divide out the number attached to the x, so you would divide 900000 by 90000.
Your answer than becomes x=10
What determines the attenuation
The intensity of the photon and the material it passes through
When matter absorbs the x-ray, what color does it show up on the film
When Matter is partically absorbed, what is it called
Attenuate or Radiolucent
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