Raphex Exam 2 Questions and answers Newest RATED A+ 2025/2026

Raphex Exam 2 Questions and answers Newest
RATED A+ 2025/2026

34. What is the purpose of the electrometer when used with an ionization chamber?
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A. it measures charge produced in ionization chamber
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B. it applies the temperature correction factor
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C. it applies the pressure correction factor
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D. it provides ionization chamber calibration factor - Correct Answers A
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II! 35. A linear accelerator is expected to deliver 1cGy/MU at a dose rate of 300MU/min for a 3DCRT
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II! treatment. However, it actually delivers 1cGy/MU at 303 MU/min. The dose actually delivered to
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II! the patients will, as a result be, _______.
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A. 3% low II! II!




B. 1% low II! II!




C. correct (no error in dose will be delivered)
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D 1% high
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E. 3% high - Correct Answers C
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II! 39. Which of the following is/are characteristic(s) of optically stimulated luminescent dosimeters
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II! (OSLD)?



A. OSLD can only be read once
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B. signal fading exists after irradiation
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C. OSLD readout occurs under high heat conditions
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, D. All of the above - Correct Answers B
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II! 41. A whole brain MU calculation uses equally weighted parallel-opposed 6MV x-rays at 100cm
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II! SAD with a 17x20cm^2 collimator setting with a small amount of MLC to shield the eyes. The
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II! prescription is for 300cGy per fraction to midplane depth. The separation on the central axis is II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!




II! 16cm. Which of the following calculation mistakes would have been the biggest effect on the
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II! MU?



A. using 100SSd setup
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B. using 18MV rather than 6MV data tables
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C. failure to divide the separation in half
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D. failure to divide the dose per fraction in half
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E. failure to account for MLC blocking and air inside the treatment fields - Correct Answers D
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II! 42. a patient is treated with a single field, SSD=100cm. The prescription is 300cGy/fraction at 5cm
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II! depth. What is the dose (cGy)/fraction at 10cm depth? Given PDD (5cm)= 87.0; PDD (10cm)=67.0.
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A. 210 II!




B. 231 II!




C. 254 II!




D. 355 II!




E. 390 - Correct Answers B; 300cGy* (67/87)= 231cGy
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II! 46. Which of the following parameters affect the photon percent depth dose?
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A. SSD II!




B. depthII!