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MDCB Practice Set 2 – Advanced Multiple Choice Questions with Verified Answers

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This document presents Practice Set 2 for the Medical Dosimetry Certification Board (MDCB) exam, featuring a wide-ranging set of verified multiple choice questions and answers. The questions address topics such as depth dose characteristics, CT number identification, radiographic image analysis, dose equivalency, radiation safety limits, LINAC QA standards (TG-142), electron beam properties, photon interactions, isocentric vs. SSD techniques, and clinical dose constraints. This resource provides an excellent opportunity for test simulation and content mastery.

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MDCB Practice Set 2 questions with verified answers
A Ans✓✓✓ 11. The quality factor (QF) used for determining the dose
equivalence for high-energy x-rays
compared to high-energy gamma rays is:
A. 0.869.
B. 0.956.
C. 1.000.
D. 1.035.


A Ans✓✓✓ 15. The value for the Ngas calibration factor for an
ionization chamber will depend on the:
A. composition of the chamber wall.
B. temperature of the air in the chamber.
C. pressure of the air in the chamber
D. source to chamber distance.


A Ans✓✓✓ 19. Irradiation of which of the following structures is most
likely to result in symptomatic late
toxicity when treating pediatric neuroblastoma?
A. bone.
B. spleen.
C. spinal cord.
D. bladder.

, A Ans✓✓✓ 2. From the techniques listed below, select the least
desirable method for treating a 3cm non-
secreting pituitary adenoma.


A. opposed lateral fields
B. opposed laterals plus a vertex field
C. non-coplanar fields
D. stereotactic radiosurgery


A Ans✓✓✓ 22. An image on a radiograph measures 12 cm. The source
to object distance is 90 cm and
the source to film distance is 110 cm. The actual size of the object is:
A. 9.8 cm.
B. 10.8 cm.
C. 12.0 cm.
D. 12.8 cm.


A Ans✓✓✓ 24. Which of the following CT numbers (Hounsfield units) is
most closely related to air?
A. -1000
B. -750
C. 0

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