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MDCB QUESTIONS AND ANSWERS GRADED A+
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MDCB QUESTIONS AND ANSWERS GRADED A+
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MDCBQUESTIONS AND
ANSWERS
GRADED A+
Evatee 9/5/24 MDCB
,MDCB QUESTIONS AND ANSWERS GRADED
A+
For a 4-fld box techn, which of the following will deliver the lower dose to the
femoral heads? Answer - 100 SSD, equal dmax dose to all fields
SSD= less hot spots
Which of the following can be classified as indirectly ionizing radiaiton? Answer
- Photons
Also neutrons, x-ray and gamma rays
The presence of a shoulder on the survival curve of most mammalian cells
indicates which of the following? Answer - a reduced efficiency of cell killing at
low doses
When opposing lateral fields to the pharynx are abutted at midline to the
anterior field to the suproclavicular fossae, overdose in the cord may be
avoided by Answer - a small block over the cord in the inf post corner of both
lateral fields
In Photoelectric interactions Answer - the entire energy of the incident photon
is absorbed by the resulting electron
Film badges used for personnel monitoring contain filters that are used to:
Answer - fitler info about beam quality and energies
Giving too much radiation to which of the following can lead to xerostomia
Answer - base of tongue
, The inguinal lymph nodes are located at a depth of Answer - 2-18 cm from the
anterior skin surface and are dependent on the pt's size
The contrast resolution for a tx planning CT scan can be described as a Answer
- measure of the ability to detect objects with small differences in hounsfield
units
a small area of high density near the surface of hte pt would have the greatest
impact on the dose near the edge of the high density are with: Answer - a
single 20 MeV electron field
-^energy ^ surface dose
Mass attenuation coefficient depends on the Answer - thickness of the
material being atttenuated
The binding energy of the nucleus Answer - represents a mass defect in the
nucleus
-binding energy of nucleus is proportional to the stability of a nucleus
Accuracy for radiation therapy tx require accuracy within: Answer - +/- 3%
daily output +/- 3%
the value for the Ngas calibration factor for an ioniziation chamber will depend
on the: Answer - composition of the chamber wall
Which are the following descriptors of characteristic x-rays or brems radiation
is true? Answer - Characteristic x-rays are produced following ionization
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