Lesson 1 (MIDTERM)

Question 1

Designed to detect or measure radiation

Answer 1

Radiation Detection Instrument

Question 2

Radiation Detection Instrument . Presence of radiation (tickling, chirping, beeping sound)

Answer 2

Pulse mode

Question 2

Operate in the pulse or rate mode

Answer 2

Radiation Detection Instrument

Question 3

Radiation Detection Instrument. the practice of measuring the intensity of radiation

Answer 3

Dosimetry

Question 3

Rate Mode

Answer 3

• measure intensity of radiation
• accumulate signal
• mGya
• Gya

Question 3

Pulse Mode

Answer 3

• mGya/hr
• mR/hr
• Gya/hr
• detect

Question 3

The earliest radiation detection device

Answer 3

Photographic Emulsion

Question 3

It is used to indicate the presence of radiation

Answer 3

Radiation Detection Instrument

Question 4

Photographic Emulsion. Uses

Answer 4

• personnel monitoring
• emulsion imaging

Question 4

It is used widely as a device to measure
radiation intensity & to detect radioactive
contamination

Answer 4

Gas-Filled Detectors

Question 4

Enumerate the radiation detection & measuring device

Answer 4

• Photographic
• Gas-filled Detectors
• Thermoluminescence Dosimetry
• Optically-Stimulated Luminescence Dosimetry
• Scintillation Detection

Question 4

Radiation Detection Instrument. the radiation-measuring devices

Answer 4

Dosimeters

Question 4

Ionization Chamber. Characteristics

Answer 4

wide range, accurate & portable

Question 5

Photographic Emulsion. Characteristic

Answer 5

• limited range
• sensitive
• energy dependent

Question 5

Gas-Filled Detectors. In general, the _____ the chamber, the _____ gas molecules are available for ionization and, therefore the _____ the instrument.

Answer 5

larger, more, more sensitive

Question 5

Ionization Chamber. Uses

Answer 5

survey for radiation levels 1 mR/hr or 10 µGy/hr

Question 5

The instrument of choice for measuring radiation intensity

Answer 5

Ionization Chamber

Question 6

Three types of Gas-Filled Detectors

Answer 6

o Ionization chamber
o Proportional counter
o Geiger- Muller counter

Question 6

Proportional Counter. Characteristics

Answer 6

laboratory equipment, accurate & sensitive

Question 6

It has the ability to distinguish between alpha & beta radiation

Answer 6

Proportional Counter

Question 7

It is used for contamination control in nuclear
medicine laboratories

Answer 7

Geiger-Muller Counter

Question 7

Scintillation Detection. Characteristics

Answer 7

limited range, very sensitive, & stationary or portable instruments

Question 7

Geiger-Muller Counter. Characteristics

Answer 7

limited to 100 mR/hr & portable

Question 7

Proportional Counter. Uses

Answer 7

assay of small quantities of radionuclides

Question 7

Scintillation Detection. Materials

Answer 7

NaI:Tl or CsI:Tl

Question 7

Geiger-Muller Counter. Uses

Answer 7

survey for low radiation levels & radioactive contamination

Question 8

Basis for the gamma camera

Answer 8

Scintillation Detection

Question 9

It is used in the detectors arrays of CT imaging system

Answer 9

Scintillation Detection

Question 10

_____ is used as _____ in digital imaging system

Answer 10

Scintillation Detection; IR

Question 11

_____ Discovered in the _____ at the _____.

Answer 11

Thermoluminescence Dosimetry (TLD) 1960 University of Wisconsin

Question 12

Thermoluminescence Dosimetry (TLD). Uses

Answer 12

personnel monitoring, stationary & area monitoring

Question 12

When exposed to ionizing radiation the crystals in _____ undergo structural changes that remains essentially stable until the crystal is _____. When _____, the stored energy is released as _____.

Answer 12

Thermoluminescence Dosimetry (TLD) Heated Light

Question 13

OSL Developed by _____ in late _____

Answer 13

Laundauer 1990s

Question 13

Thermoluminescence Dosimetry (TLD). Materials

Answer 13

Lithium Fluoride, Calcium Fluoride, Lithium Borate & Calcium Sulfate

Question 14

Optically Stimulated Luminescence Dosimetry (OSL). Material

Answer 14

Aluminum oxide (Al2 O3 )

Question 14

Thermoluminescence Dosimetry (TLD). Characteristics

Answer 14

wide range, accurate & sensitive o as low as 5 mrad o >10 rad

Question 15

Thermoluminescence Dosimetry (TLD). Advantages

Answer 15

- Size - Reusable - Responds proportionately to dose - Rugged

Question 16

Optically Stimulated Luminescence Dosimetry (OSL). Enumerate step process

Answer 16

o Exposure to ionizing radiation o Laser illumination o Measurement of the intensity of stimulated light emission

Question 16

Enumerate Advantages of OSL over TLD

Answer 16

* More sensitive – 1 mrad or 10 µGyt * Reanalysis * Wide dynamic range * Excellent long-term stability