Radiation Safety and Protection Flashcards

Which survey instrument is best for detecting small amounts of radioactive contamination on a work surface?

Answer: Geiger-Mueller (GM) counter

GM counters are highly sensitive and ideal for finding low-level contamination.

Which survey instrument is preferred for accurately measuring exposure rates around a linac or brachytherapy patient?

Answer: Ionization chamber survey meter (cutie pie)

Ion chamber survey meters respond accurately to exposure rate over a wide energy range.

What material is used in optically stimulated luminescence (OSL) personnel dosimeters?

Answer: Aluminum oxide doped with carbon

OSL badges use Al2O3:C, which releases light proportional to dose when stimulated by a laser.

When a lead apron is worn, where should a single personnel dosimeter be placed?

Answer: At the collar outside the apron

Wearing the badge at the collar outside the apron estimates dose to the unshielded head, neck and eyes.

What happens on a properly functioning linac when the treatment room door is opened during beam-on?

Answer: The door interlock terminates the beam

Door interlocks immediately stop irradiation when the vault door opens.

A DOT radioactive shipping label marked Yellow-III indicates a transport index up to what value?

Answer: 10

Yellow-III labels apply to packages with a transport index above 1 and up to 10.

Following a medical event involving a brachytherapy patient, the NRC must be notified by telephone no later than when?

Answer: The next calendar day after discovery

10 CFR 35.3045 requires notification by the next calendar day, with a written report within 15 days.