Radiation Detection & Measurement Flashcards
State the measuring device used to detect low levels of radiation such as scatter.
Cutie Pie Survey Meter
What is the weighting factor for beta radiation?
2
The SI unit for roentgen is _________________________.
Coulombs/kg
What is the weighting factor for gamma radiation?
1
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?
Gas-filled detector such as an ionization chamber.
State the units used to describe the amount of energy absorbed by matter (aka patient).
Rad or Gray
240 REM = _______
2.4 Sieverts
Crystal scintillation detectors are used in ______________________.
Computed tomography
How many rads equals 2 grays?
200 rads
State the SI unit that corresponds with the rad.
Gray
State the units that apply to the biological effect of different ionizing radiations.
Rem or sievert
Name the type of personal monitoring device that uses film in a light tight envelope to detect radiation.
Film badge dosimeter
1 Becquerel = _________ dps
1
State the formula used to figure equivalent dose.
Average RAD x Weighting Factor
3.7x10^10 disintegrations/seconds=
1 curie
one roentgen(R) equals_____ x 10^-4 coulmbs/kg
2.58
Are alpha or gamma radiation more biological damaging?
Alpha
.01 joules/kg or 10^-2 joules/kg equals ______.
RAD
Roentgens and coulombs/kg are units used to describe what?
Intensity of radiation beam
A gas-filled device that may be used to determine the output of radiographic units is the __________________________.
Ionization chamber-Electrometer combination
The SI unit for radioactive atoms undergoing decay/time is the __________.
Becquerel
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 ______________.
Roentgen
Name the type of personal monitoring device that uses a aluminum oxide strip to detect radiation exposure.
OSL
Name the type of personal monitoring device that uses crystals chips to measure radiation dose.
TLD
Radiation that have passed through the patient is known as?
Remnant
Name the SI unit for rad.
Joule
State the device used in nuclear medicine to detect the presence of radioactivity.
Geiger-Muller Counter
Name the type of personal monitoring device used to give immediate feedback of total exposure.
Pocket dosimeter
When using fluoroscopy, the intensity of the beam would be described as _____________.
Roentgen per time: R/min (roentgen per minute) or R/sec (roentgen per second)
The process by which x-rays lose their energy as it passes through material is known as?
Ionization
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 ______________.
Proportional counters
Not every photon in the beam interacts with matter (aka the patient). Name the unit used to measure photon interaction or patient absorption.
Rad (radiation absorbed dose)
What does the letters REM stand for?
Radiation Equivalent in Man
Liquid scintillation detectors are used in ______________________.
Photomultiplier tubes
The traditional unit used to describe radioactive material is the _________.
Curie
A radiation monitoring report would express a rediologic technologist’s dose equivalent in which of the following?
REM
A PA chest radiograph delivers approximatley what dose to the patient?
10 mrad
The approximate output intensity of a radiographis x-ray tube is
5 mR/mas
the roentgen is a unit of measurethat specifies which of the following
intensity of x-rays
Which of the following is a traditional unit or radiation?
REM
Absorbed dose can be measured in
gray
which of the following is a unit of radioactivity
curie
in diagnostic radiology, it is acceptalbe to assuem that 1R is equal to
1 RAD
in the SI system
1000 rad is equivalent to 10 gy
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
coulomb refers to electrons released in ionization
Which of the following is used in a TLD?
lithium Fluoride
Which of the following measures ionization events in air?
an ion chamber
the amount of light emitted by a scintillation phosphor is proportionala to what feature of photon energy
absorbed
Which of the following is characteristic of a geiger-muller counter
measures counts per minute
The type of personnal radiation devices commonly used today uses which of the following
Laser light to stimulated aluminum oxide and measures luminescence in pproportion to absorbed radiation
