Homework 3 Flashcards
TG21 uses which parameter for determining the electron energy when calculating the absorbed dose?
a. surface depth dose
b. 50% depth dose
c. depth dose at dmax
d. depth dose at one HVL
b. 50% depth dose
in a cylindrical ionization chamber the point of measurement when measuring electrons is
a. on the entrance window of the detector
b. on the surface of the central electrode
c. shifted towards the source of the electrons
d. on the inner surface of the thimble
c. shifted towards the source of the electrons
primary photon and electron calibrations are measured in what type of phantom?
a. solid water
b. water
c. PMMA
d. all of the above
b. water
which type of dose measuring device users diodes and a wheatstone bridge?
a. calorimetry
b. solid state dosimeter
c. fricke dosimeter
d. wheatstone dosimeter
a. calorimetry
which of the following is considered a solid state detector?
a. OSLDs
b. TLDs
c. semiconductor junction detectors
d. all of the above
d. all of the above
which radiaiton detector determines the radiation dose by measuring the amount of blue light emitted when the detector is stimulated with green light? a. silicon diode b. OSLD c. fricke D. TLD
b. OSLD
which radiaiton detector is most useful for measuring radiaition at sharp gradients of the radiation field?
a. silicon diode
b. TLD
c. OSDL
d. all of the above
d. all of the above
which measurement technique is a direct measure of radiaiton dose?
a. TLD
b. OSLD
c. ionization chamber
d. calorimetry
d. calorimetry
which is not true about radiochromic film for dose measurement?
a. measures dose directly
b. large dose range
c. low energy dependence
d. high spatial resolution
e. insensitive to visible light
a. measures dose directly
which radiation detector releases stored energy when heat is applied to the detector?
a. TLD
b. NKD
c. OSLD
b. diode
a. TLD
which of the following can be used to measure beam quality of a megavoltage photon beam?
a. HVL
b. PDD at 10 cm
c. TPR at 5 cm and 10 cm
d. depth where PDD is 50%
b. PDD at 10 cm
