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Radiation Biology > Radiation Detection & Measurement > Flashcards

Radiation Detection & Measurement Flashcards

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1
Q

State the measuring device used to detect low levels of radiation such as scatter.

A

Cutie Pie Survey Meter

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2
Q

What is the weighting factor for beta radiation?

A

2

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3
Q

The SI unit for roentgen is _________________________.

A

Coulombs/kg

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4
Q

What is the weighting factor for gamma radiation?

A

1

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5
Q

Radiation passing through an air-filled chamber causing ionization of the air molecules releasing electrons which are then measured is an example of what type of radiation measuring device?

A

Gas-filled detector such as an ionization chamber.

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6
Q

State the units used to describe the amount of energy absorbed by matter (aka patient).

A

Rad or Gray

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7
Q

240 REM = _______

A

2.4 Sieverts

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8
Q

Crystal scintillation detectors are used in ______________________.

A

Computed tomography

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9
Q

How many rads equals 2 grays?

A

200 rads

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10
Q

State the SI unit that corresponds with the rad.

A

Gray

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11
Q

State the units that apply to the biological effect of different ionizing radiations.

A

Rem or sievert

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12
Q

Name the type of personal monitoring device that uses film in a light tight envelope to detect radiation.

A

Film badge dosimeter

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13
Q

1 Becquerel = _________ dps

A

1

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14
Q

State the formula used to figure equivalent dose.

A

Average RAD x Weighting Factor

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15
Q

3.7x10^10 disintegrations/seconds=

A

1 curie

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16
Q

one roentgen(R) equals_____ x 10^-4 coulmbs/kg

A

2.58

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17
Q

Are alpha or gamma radiation more biological damaging?

A

Alpha

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18
Q

.01 joules/kg or 10^-2 joules/kg equals ______.

A

RAD

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19
Q

Roentgens and coulombs/kg are units used to describe what?

A

Intensity of radiation beam

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20
Q

A gas-filled device that may be used to determine the output of radiographic units is the __________________________.

A

Ionization chamber-Electrometer combination

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21
Q

The SI unit for radioactive atoms undergoing decay/time is the __________.

A

Becquerel

22
Q

As the x-ray beam travels through air, it liberates charges (+ and -). The unit used to measure the amount of charges (aka ionizations) in one kg of air is the ______________.

A

Roentgen

23
Q

Name the type of personal monitoring device that uses a aluminum oxide strip to detect radiation exposure.

A

OSL

24
Q

Name the type of personal monitoring device that uses crystals chips to measure radiation dose.

A

TLD

25
Q

Radiation that have passed through the patient is known as?

A

Remnant

26
Q

Name the SI unit for rad.

A

Joule

27
Q

State the device used in nuclear medicine to detect the presence of radioactivity.

A

Geiger-Muller Counter

28
Q

Name the type of personal monitoring device used to give immediate feedback of total exposure.

A

Pocket dosimeter

29
Q

When using fluoroscopy, the intensity of the beam would be described as _____________.

A

Roentgen per time: R/min (roentgen per minute) or R/sec (roentgen per second)

30
Q

The process by which x-rays lose their energy as it passes through material is known as?

A

Ionization

31
Q

A type of device that measures the intensity and type of radiation by the number and/or size of the pulses generated by the electron current is the ______________.

A

Proportional counters

32
Q

Not every photon in the beam interacts with matter (aka the patient). Name the unit used to measure photon interaction or patient absorption.

A

Rad (radiation absorbed dose)

33
Q

What does the letters REM stand for?

A

Radiation Equivalent in Man

34
Q

Liquid scintillation detectors are used in ______________________.

A

Photomultiplier tubes

35
Q

The traditional unit used to describe radioactive material is the _________.

A

Curie

36
Q

A radiation monitoring report would express a rediologic technologist’s dose equivalent in which of the following?

A

REM

37
Q

A PA chest radiograph delivers approximatley what dose to the patient?

A

10 mrad

38
Q

The approximate output intensity of a radiographis x-ray tube is

A

5 mR/mas

39
Q

the roentgen is a unit of measurethat specifies which of the following

A

intensity of x-rays

40
Q

Which of the following is a traditional unit or radiation?

A

REM

41
Q

Absorbed dose can be measured in

A

gray

42
Q

which of the following is a unit of radioactivity

A

curie

43
Q

in diagnostic radiology, it is acceptalbe to assuem that 1R is equal to

A

1 RAD

44
Q

in the SI system

A

1000 rad is equivalent to 10 gy

45
Q

when using SI radiation exposure is defined in units of coulombs/kilogram. with regards to this unit of measure, which of the following is true

A

coulomb refers to electrons released in ionization

46
Q

Which of the following is used in a TLD?

A

lithium Fluoride

47
Q

Which of the following measures ionization events in air?

A

an ion chamber

48
Q

the amount of light emitted by a scintillation phosphor is proportionala to what feature of photon energy

A

absorbed

49
Q

Which of the following is characteristic of a geiger-muller counter

A

measures counts per minute

50
Q

The type of personnal radiation devices commonly used today uses which of the following

A

Laser light to stimulated aluminum oxide and measures luminescence in pproportion to absorbed radiation

Radiation Biology (5 decks)

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