2025 RAPHEX EXAM 2 QUESTIONS

2025 RAPHEX EXAM 2 QUESTIONS &

ANSWERS SCORED A+

• What is the purpose of the electrometer when used with an ionization

chamber?

• it measures charge produced in ionization chamber
• it applies the temperature correction factor
• it applies the pressure correction factor
• it provides ionization chamber calibration factor Answer - A
• A linear accelerator is expected to deliver 1cGy/MU at a dose rate of

300MU/min for a 3DCRT treatment. However, it actually delivers 1cGy/MU at 303 MU/min. The dose actually delivered to the patients will, as a result be,

_______.

• 3% low
• 1% low
• correct (no error in dose will be delivered)

D 1% high

• 3% high Answer - C
• Which of the following is/are characteristic(s) of optically stimulated

luminescent dosimeters (OSLD)?

• OSLD can only be read once
• / 1