Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
the absorbed-dose to water calibration factor for anion chamber located under reference conditions in a radiationbeam at the chamber’spoint of measurement in the absence of the chamber. |
|
|
P_gr (gradient effects) |
needed if measuring electrons with a farmer chamber |
|
|
P_ion (recombination effects) |
account for ion pairs recombining before collection |
|
|
P_pol (polarity effects) |
changes in reading when voltage is reversed on chamber |
|
|
P_wall (wall corrections) |
if the chamber wall is not of the same material as the phantom then a correction factor is needed due to electrons created during ionization events in the wall of the chamber. |
|
|
P_cel (central electrode corrections) |
the central electrode may also be constructed of various materials (aluminum, graphite) requiring a correction for interactions occurring within it. higher Z electrode :: Higher current readout |
|
|
k_Q: photons |
photon quality conversion factor from calibration beam type to beam of interest Lookup table using %dd(10)x |
|
|
k_Q: electrons |
electron quality conversion factor from calibration beam type to beam of interest |
|
|
d_ref: photons |
10cm |
|
|
d_ref: electrons |
0.6R_50 - 0.1cm |
|
|
Setup: Photons to find k_Q |
100SSD, 10x10cm^2, value at 10cm depth |
|
|
Setup: Electrons to find R50 |
100SSD, 10x10cm^2, value at 50% of max |
|
|
Setup: Photon dosimetry measurements |
100SSD or 100SAD, 10x10cm^2, 10cm depth |
|
|
Setup: Electron dosimetry measurements |
90-110cm SSD, for R50<8.5cm, 10x10cm^2 else, 20x20cm^2 dref = 0.6R50 - 0.1cm |
|
|
TMR to PDD conversion |
|
