Brachytherapy- Dosimetry questions with verified
answers
1 Ci=___Bq Ans✓✓✓ 3.7 x 10^10
a .3mm filter for a radium source would represent what change in
exposure rate constant Ans✓✓✓ 4% increase
a 3 cm 3d tumor that is to be treated by an interstitial implant would
probably best be treated by this type of source configuration Ans✓✓✓
volume
a benign condition of the conjuctiva of the eye tx'd with radiation is
called Ans✓✓✓ pterygium of the eye
a Cs source is usually replaced every __ years Ans✓✓✓ 30
a device used to staple in permanent interstitial sources is a ___
applicator Ans✓✓✓ mick
a lateral film visualizes what dimensions Ans✓✓✓ y,z
a measure of the activity of a source as compared to radium is called
Ans✓✓✓ gamma factor
,exposure rate constant
K-factor
a relatively new source similar to I125 but having a shorter T 1/2 and
much higher rate of dose delivery is called Ans✓✓✓ Palladium 103
a source inventory must contain what 4 bits of info Ans✓✓✓ time of
delivery
total dose delivered
type of applicator used
amount and size of source
a source such as a radium needle that has the more active sources
located at one end is termed Ans✓✓✓ indian club
a term that relates in a manner similar to cobalt "timer error" with
respect to HDR is Ans✓✓✓ transit time effect
a two plane implant will adequately treat a volume of tissue how many
cm thick Ans✓✓✓ 1-2.5 cm
a type of 3D film technique for implant localization whereby 2
radiographs are taken of same view but xray tube is shifted a certain
distnace Ans✓✓✓ stereo shift
, according to khan, uniformity of source placement is least important
for which type of implant system Ans✓✓✓ paterson-parker
adequate hospital room wall protection for LDR BT applications is
obtained with concrete thickness around Ans✓✓✓ 20-25 cm
advantages of Cs over radium when used for BT include Ans✓✓✓ Cs
storage is easier
protection is less difficult
Cs costs less
after insertion of radiation sources the radiation oncology department
must Ans✓✓✓ post warning sign on or by door
place warning sign on chart
include nursing instructions and place those in the patients chart
performed a radiation exposure survey
an ophthalmologic applicator curved to conform to the surface of the
eye is a Ans✓✓✓ beta plaque
another name for BT surface applicator is a Ans✓✓✓ plaque
answers
1 Ci=___Bq Ans✓✓✓ 3.7 x 10^10
a .3mm filter for a radium source would represent what change in
exposure rate constant Ans✓✓✓ 4% increase
a 3 cm 3d tumor that is to be treated by an interstitial implant would
probably best be treated by this type of source configuration Ans✓✓✓
volume
a benign condition of the conjuctiva of the eye tx'd with radiation is
called Ans✓✓✓ pterygium of the eye
a Cs source is usually replaced every __ years Ans✓✓✓ 30
a device used to staple in permanent interstitial sources is a ___
applicator Ans✓✓✓ mick
a lateral film visualizes what dimensions Ans✓✓✓ y,z
a measure of the activity of a source as compared to radium is called
Ans✓✓✓ gamma factor
,exposure rate constant
K-factor
a relatively new source similar to I125 but having a shorter T 1/2 and
much higher rate of dose delivery is called Ans✓✓✓ Palladium 103
a source inventory must contain what 4 bits of info Ans✓✓✓ time of
delivery
total dose delivered
type of applicator used
amount and size of source
a source such as a radium needle that has the more active sources
located at one end is termed Ans✓✓✓ indian club
a term that relates in a manner similar to cobalt "timer error" with
respect to HDR is Ans✓✓✓ transit time effect
a two plane implant will adequately treat a volume of tissue how many
cm thick Ans✓✓✓ 1-2.5 cm
a type of 3D film technique for implant localization whereby 2
radiographs are taken of same view but xray tube is shifted a certain
distnace Ans✓✓✓ stereo shift
, according to khan, uniformity of source placement is least important
for which type of implant system Ans✓✓✓ paterson-parker
adequate hospital room wall protection for LDR BT applications is
obtained with concrete thickness around Ans✓✓✓ 20-25 cm
advantages of Cs over radium when used for BT include Ans✓✓✓ Cs
storage is easier
protection is less difficult
Cs costs less
after insertion of radiation sources the radiation oncology department
must Ans✓✓✓ post warning sign on or by door
place warning sign on chart
include nursing instructions and place those in the patients chart
performed a radiation exposure survey
an ophthalmologic applicator curved to conform to the surface of the
eye is a Ans✓✓✓ beta plaque
another name for BT surface applicator is a Ans✓✓✓ plaque
