Ch5

Question 1

monitoring of equivalent dose to any person occupationally exposed on a
regular basis to ionizing radiation

• risk receiving 10% or more of the annual dose 50 mSv (5 rem) in any single YEAR
• limit month l0.05 mSv (50 mrem)

Answer 1

Personnel dosimetry

Question 2

first, or primary, dosimeter is to be worn

Answer 2

outside the protective apparel at collar level.

Question 3

second dosimeter should be worn

Answer 3

beneath a wraparound-style lead apron at waist level.

Question 4

For pregnant diagnostic imaging personnel

Answer 4

• Primary dosimeter is worn at collar level.
  > Second monitoring device is worn at abdominal level.

Question 5

ring badge is worn as a second monitor when performing radiographic procedures that require the hands to be near the primary x-ray beam

• extremity dosimeter

Answer 5

A thermoluminescent dosimeter (TLD)

Question 6

Personnel Dosimeters
Characteristics

Answer 6

• Lightweight and easy to carry
  > materials durable
  > Able to detect small and large exposures
• cant be affected
• cheap

Question 7

Two types of Personnel Dosimeters

Answer 7

Optically Stimulated Luminescence Dosimeter (OSL)
› Direct lon Storage (DIS)

Question 8

• Most common used for diagnostic imaging and radiation therapy.
• • Contains an aluminum oxide detector.
• Energy discrimination: filters made of aluminum, tin and copper

Sensitivity: accurate reading as low as 10mSv
• Control monitor

Answer 8

Optically Stimulated Luminescence Dosimeter (OSL)

Question 9

Advantages Optically Stimulated Luminescence Dosimeter (OSL)

Answer 9

Lightweight, durable, easily worn
> Preloaded packet
> Allows for reanalysis

Question 10

Disadvantages Optically Stimulated Luminescence Dosimeter (OSL)

Answer 10

• Occupational exposure is recorded only in the body area where the devise is attached.

> Exposure cannot be immediately determined

Question 11

• Small ionization gas filled dosimeter connected to a solid state device with electrically erasable programmable read-only Radiation ionizes the gas
• Radiation ionizes the gas in the chamber and the electric charge will “read out” by introducing a signal

• Read out through a physical connecting device

Answer 11

Direct on Storage Dosimeter

• adventages : Instant access to daa
  Lightweight and durable
• disadvantage: Must be wom to be accurae

Question 12

Radiation Survey Instruments for
(Cio) Area Monitoring Three categories :

Answer 12

without a readout scale
> with a readout scale
> Ionization-chamber based

Question 13

3 Gas-filled detectors :

Answer 13

> lonization chamber-type survey meter (cutie pie)
› Proportional counter
› GM survey meter

Question 14

Sensitivity ranges and uses
> Advantages and disadvantages
• Proportional Counter

Geiger-Müller Survey Meter
> Sensitivity and use
> Components
> Disadvantages

Answer 14

lonization chamber-type survey meter (cutie pie)