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Dose Tolerances > Detection Equipment/Usage > Flashcards

Detection Equipment/Usage Flashcards

1
Q

LINAC Commissioning Equipment

A

Water Scanner - 2 ion chambers

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2
Q

LINAC X-Ray Calibration Equipment

A

Ion Chambers - farmer detector (.3cc to .6cc)

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3
Q

LINAC e’ Calibration Equipment

A

Ion Chambers - Parallel Plate

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4
Q

LINAC Flatness/Symmetry Equipment

A

Ion Chamber, Film

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5
Q

LINAC Daly Output Equipment

A

Ion Chamber, Diode

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6
Q

Pt dosimetry equipment

A

TLD’s, Diodes, OSL - positioning

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7
Q

Personal Monitoring equipment

A

Film, TLDs

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8
Q

Shielding survey leaks Equipment

A

GM Detector

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9
Q

Shielding survey X-Ray Equipment

A

Ion Chamber

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10
Q

Shielding survey Neutron Equipment

A

Proportion Counter - Rem-Ball or Activation Method

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11
Q

Brachy Pt Survey Equipment

A

Ion Chamber

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12
Q

Lost Seed Survey Equipment

A

GM Detector

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13
Q

HDR/LDR Source Calibration Equipment

A

Ion Chamber - RE-entrant chamber

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14
Q

Nuc Med Calibration Equipment

A

Ion Chamber

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15
Q

Thyroid Uptake Equipment

A

Scintillation Detector - sodium iodide

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16
Q

Nuc Med Camera Equipment

A

Scintillation Detector

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17
Q

What is used to find leaks, lost sources, etc…, and measures beta and gamma

A

GM Detector

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18
Q

What is used for pt surveys and shielding surveys, and measures beta and gamma

A

Handheld ion chamber

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19
Q

Used for pt surveys and general surveys, and measures alpha, beta, and gamma

A

Cutie Pie Ion Chamber

20
Q

Used for contamination surveys

A

Alpha Probe

21
Q

Used for Neutron surveys

22
Q

Used for LINAC Calibration, and measures photons and electrons

A

Farmer Chamber

23
Q

Used for LINAC Calibration of electrons

A

Parallel Plate Ion Chamber

24
Q

Used for HDR source calibration

A

RE-entrant Ion Chamber

25
Q

Used for contamination survey

A

Well detector (Nal)

26
Q

Used for thyroid bioassay (uptake)

A

Nal detector

27
Q

Used for pt dosimetry measurements

28
Q

Used for IMRT QA

A

Detector Array (1000 diodes)

29
Q

Used for LINAC commissioning

A

Water Scanner

30
Q

How are gas filled detectors measured?

A

DC voltage (x-axis) x Voltage Pulse Height (signal)

31
Q

Name the sections and ranges of gas-filled detectors:

A 
A: recombination - < 150 volts
B: Ion chamber Region - 150 to 500 volts**
C: Proportional Region**
D: Geiger Muller Region**
E: Continuous Discharge Region
32
Q

Describe the Ionization Region of gas-filled detectors:

A
  1. voltage is sufficient to prevent recombination
  2. Does NOT count individual event
  3. Prevents Gas multiplication by - low V battery, and large collecting electrode
  4. Used as survey meters, dose calibrators, and therapy chambers
33
Q

Describe the Proportional Region of gas-filled detectors:

A
  1. Gas Multiplication
  2. Detects individual events
  3. Can distinguish between alpha and beta
  4. Detects thermal neutrons
  5. Used for LINAC shielding surveys (Rem Ball)
34
Q

Describe the Geiger Muller Region of gas-filled detectors:

A
  1. Output pulse is constant regardless of E
  2. Multiplication factor of 10^8 to 10^10
  3. Unable to distinguish E
  4. Detects individual events
  5. Long Dead Time (300 usec) - cannot measure the radiation during this time
  6. Saturation - may read background dose under high dose rate conditions
  7. Used to detect presence of radiation (not dose measuring)
35
Q

Name the uses of Gafchromic Film:

A
  1. Opthalmic Applicator dosimetry: Sr-90
  2. Brachy Dosimetry
  3. Stereotactic Radiosurgery Dosimetry
  4. Dosimetry in the Penumbra Region
  5. Intravascular Brachytherapy Dosimetry
  6. Proton Dosimetry
36
Q

Gafchromic film depends on what?

A
  1. Absorbed dose
  2. Temp during irradiation
  3. Post-Irradiation Reading Time - must wait at least 24hrs
37
Q

Name the advantages of TLD:

A
  1. Range: mrad to 10^3
    2 Dose Rate Independent
  2. Small size and reusable
38
Q

Name the disadvantages of TLD:

A
  1. Storage instability
  2. Fading
  3. Lack of Uniformity
39
Q

What are the uses of TLDs?

A

Personal Monitoring and Dosimetry Measurements

40
Q

For scintillation detectors, light is _____ to energy deposited?

A

proportional

41
Q

What are the advantages of a Scintillation Detector?

42
Q

What are the disadvantages of a Scintillation Detector?

A

Fragile, hygroscopic, and expensive

43
Q

What are common uses for Scintillation Detectors?

A

Surveys for low E radiation, and for thyroid uptake studies

44
Q

Name 3 types of Point Detectors:

A
  1. PP - electrons
  2. diodes
  3. Microchamber - really small volume
45
Q

What are the advantages of diodes?

A
  1. small size
  2. high sensitivity
  3. instantaneous read-out
  4. no bias voltage
  5. simple
46
Q

What are the disadvantages of diodes?

A
  1. cables
  2. background signal: low dose rate problem
  3. long-term calibration drift
  4. variability of calibration with temp
  5. can be unreadible
  6. damage
47
Q

What are common uses of diodes?

A
  1. Water tank dosimetry
  2. TBI Doses
  3. Electron measurements
  4. Pt dose monitoring

Dose Tolerances (23 decks)

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