Radiation Detection & Measurement

Question 1

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

Answer 1

Cutie Pie Survey Meter

Question 2

What is the weighting factor for beta radiation?

Answer 2

2

Question 3

The SI unit for roentgen is _________________________.

Answer 3

Coulombs/kg

Question 4

What is the weighting factor for gamma radiation?

Answer 4

1

Question 5

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?

Answer 5

Gas-filled detector such as an ionization chamber.

Question 6

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

Answer 6

Rad or Gray

Question 7

240 REM = _______

Answer 7

2.4 Sieverts

Question 8

Crystal scintillation detectors are used in ______________________.

Answer 8

Computed tomography

Question 9

How many rads equals 2 grays?

Answer 9

200 rads

Question 10

State the SI unit that corresponds with the rad.

Answer 10

Gray

Question 11

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

Answer 11

Rem or sievert

Question 12

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

Answer 12

Film badge dosimeter

Question 13

1 Becquerel = _________ dps

Answer 13

1

Question 14

State the formula used to figure equivalent dose.

Answer 14

Average RAD x Weighting Factor

Question 15

3.7x10^10 disintegrations/seconds=

Answer 15

1 curie

Question 16

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

Answer 16

2.58

Question 17

Are alpha or gamma radiation more biological damaging?

Answer 17

Alpha

Question 18

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

Answer 18

RAD

Question 19

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

Answer 19

Intensity of radiation beam

Question 20

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

Answer 20

Ionization chamber-Electrometer combination

Question 21

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

Answer 21

Becquerel

Question 22

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 ______________.

Answer 22

Roentgen

Question 23

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

Answer 23

OSL

Question 24

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

Answer 24

TLD

Question 25

Radiation that have passed through the patient is known as?

Answer 25

Remnant

Question 26

Name the SI unit for rad.

Answer 26

Joule

Question 27

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

Answer 27

Geiger-Muller Counter

Question 28

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

Answer 28

Pocket dosimeter

Question 29

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

Answer 29

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

Question 30

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

Answer 30

Ionization

Question 31

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 ______________.

Answer 31

Proportional counters

Question 32

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

Answer 32

Rad (radiation absorbed dose)

Question 33

What does the letters REM stand for?

Answer 33

Radiation Equivalent in Man

Question 34

Liquid scintillation detectors are used in ______________________.

Answer 34

Photomultiplier tubes

Question 35

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

Answer 35

Curie

Question 36

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

Answer 36

REM

Question 37

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

Answer 37

10 mrad

Question 38

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

Answer 38

5 mR/mas

Question 39

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

Answer 39

intensity of x-rays

Question 40

Which of the following is a traditional unit or radiation?

Answer 40

REM

Question 41

Absorbed dose can be measured in

Answer 41

gray

Question 42

which of the following is a unit of radioactivity

Answer 42

curie

Question 43

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

Answer 43

1 RAD

Question 44

in the SI system

Answer 44

1000 rad is equivalent to 10 gy

Question 45

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

Answer 45

coulomb refers to electrons released in ionization

Question 46

Which of the following is used in a TLD?

Answer 46

lithium Fluoride

Question 47

Which of the following measures ionization events in air?

Answer 47

an ion chamber

Question 48

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

Answer 48

absorbed

Question 49

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

Answer 49

measures counts per minute

Question 50

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

Answer 50

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