Thermoluminescense Dosimetry (TLD)

Question 1

Thermoluminescent Dosimeters contain ______ and have a wide dosimetric range up to ______.

Answer 1

Small crystals; 100s of Gys

Question 2

A TLD is a passive dosimeter in that it requires

Answer 2

No cables

Question 3

What are the advantages of a TLD? (5)

Answer 3

1. Measures greater range of doses
2. Easily obtainable
3. Can be read onsite
4. Quicker readout
5. Reusable

Question 4

What are the disadvantages of TLD? (2)

Answer 4

1. Dose read once

2. Readout process zeroes TLD

Question 5

What type of sensing material does the interior of the TLD consist of?

Answer 5

Lithium Fluoride crystals

Question 6

Ionizing radiation causes the electrons in the LiF to absorb more energy and become _______ to higher levels.

Answer 6

Excited

Question 7

Impurities in the LiF crystals causes the electrons to become ______.

Answer 7

Trapped

Question 8

When the LiF crystals are heated, electrons rise to a ______ band and releases in the form of ______.

Answer 8

Conduction; visible light

Question 9

Energy emitted is equal to the difference between the electron binding energy of the two ______.

Answer 9

Orbitals

Question 10

Intensity of the light is proportional to the amount of ______ that interacted with the crystals.

Answer 10

Radiation

Question 11

What are the four components of a TLD?

Answer 11

Heater; Analyzer: Photomultiplier Tube; Meter

Question 12

What does the heater do?

Answer 12

Raises phosphor temperature

Question 13

What does the photomulitplier tube do?

Answer 13

Measures light output

Question 14

What does the meter do?

Answer 14

Displays and records data

Question 15

What does the analyzer do?

Answer 15

Measures the amount of ionizing radiation exposed?

Question 16

DDE stands for

Answer 16

Deep dose equivalent

Question 17

LDE stands for

Answer 17

Eye (Lens) dose equivalent

Question 18

SDE stands for

Answer 18

Shallow dose equivalent