A photon ejects an electron from an atom, that electron has enough energy to eject a second electron. The second electron is a _______.
What is delta ray.
100
The measurement of ionization produced in air by photons.
What is the Roentgen.
100
The thickness of a material required to attenuate the intensity of the beam to half of its original intensity.
What is half value layer.
100
The measure of the biologically significant effects produced by ionizing radiation.
What is absorbed dose.
200
Uses high frequency electromagnetic waves to accelerate electrons to high energies.
What is a linear accelerator.
200
I= Io(e)^-mu(x)
What is photon beam attenuation formula.
200
In a specific volume, each particle has a specific energy level and charge and is replaced with an particle with the same energy and charge.
What is particle equilibrium.
200
Used to make the beam more uniform in intensity in a linear accelerator.
What is a flattening filter.
200
Absorbed does is measured in this.
What is rads/Gray.
300
Creates/amplifies pulsed microwaves that are then injected into the accelerator tube via the waveguide system.
What is the magnetron/kylstron.
300
I/Io = 1/2
What is half value layer formula.
300
Photons pass between a pair of parallel plates. Then high voltage is applied between the plates to collect ions produced in the air between the plates and measured.
What is a free-air-ion chamber.
300
A single parameter that describes the overall penetrability of the beam.
What is half value layer.
300
Ionization produced in a gas filled cavity surrounded in a medium is related to the energy absorbed in that medium.
What is Bragg Gray theory.
400
Treats within the 150 - 250 MeV range
What is proton therapy.
400
A photon passes close to an electron and causes it to oscillate. The oscillating electron then re-irradiates energy at the same energy and frequency as the initial photon.
What is coherent scattering.
400
The temperature-pressure correction formula.
What is Ct,p = (760/P) x ((273+T)/295).
400
Energy of photons in a monoenergetic beam which is attenuated at the same rate as the radiation in question. (a heterogenous beam)
What is effective energy.
400
A dosimeter that uses the oxidization of Fe^2+ to Fe^3+.
What is Fricke dosimeter.
500
Particles reach their peak potential near the end of their path followed by rapid falloff to zero.
What is Bragg peak.
500
A photon above the energy of 1.02 MeV reacts with the nucleus of an atom and gives up all of its energy to create a negative electron and a positive electron.
What is pair production.
500
Ratio of the number of ions collected to the number of ions produced from an accelerator.
What is collection efficiency.
500
Characterizes the beam by one energy parameter, determined before the electrons hit the target.
What is max energy.
500
This material is used in TLDs because it has a density of 8.2, close to tissue at 7.4.