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46 terms

Radiation Protection I: Test 1 (Review Questions)

STUDY
PLAY
ADE Formula (hint: 2 different ways)
REM = RAD x QF
Sievert = GRAY x QF
ADE units
Traditional REM
SI Sievert
Ionization in air unit
Roentgen
Worker's Dose unit
REM (mrem)
Patient's Dose unit
RAD
Rate at which energy is transferred from ionizing radiation to soft tissue. (per unit of travel in a material)
LET
This radiation dosimeter uses Lithium Fluoride
TLD
This radiation dosimeter uses aluminum oxide
OSL
This radiation dosimeter uses Sodium iodide
Scintillation
The most sensitive device fro the detection of gamma radiation
Scintillation
The type of dosimeter that has a self-reading meter
PIC (Pocket Dosimeter)
The unit to measure the radiation output of a x-ray tube
Roentgen
Rad can measure these types of radiation
All types of radiation
Roentgen can measure these types of radiation
X-ray and gamma
A film badge can measure these types of radiation
X-ray, Gamma, beta
Rem can measure these types of radiation
X-ray, gamma and beta
The smallest radiation exposure that can be detected by a biological method
25,000 mrem (25 rems)
The purpose of personnel radiation monitoring
To insure that radiation exposures are kept below MPD (DEL)
The LET for gamma and X-ray, and the reason
Low, 3 keV/micro meter; both are highly penetrating types of radiation
The "R" part of the ionization chamber voltage curve
Recombination: very low voltage, no electron attracted to electrode; ion pairs recombine
The "I" part of the ionization chamber voltage curve
Ionization: 100 - 300 volts; Ionization chamber operates here; no recombination of ion pairs occurs due to voltage level
The "P" part of the ionization chamber voltage curve
Proportional; The number of secondary ion pairs is proportional to the primary number of ion pairs produced
The "GM" part of the ionization chamber voltage curve
G-M Counter operates here
The "CD" part of the ionization chamber voltage curve
Continuous Discharge; sufficient voltage to cause spontaneous ionization of the chamber gases
The SI unit for the measurement of absorbed dose for all types of ionizing radiations
GRAY
The amount of light obtained when the TLD crystal is heated is related to this
How much energy the crystal absorbed
Primary radiation - Exit radiation = ?
Attenuation
(Remnant) Radiation exiting patient
Exit Radiation
Occurs when primary radiation interacts with matter
Secondary radiation
Form of secondary; changes direction
Scatter Radiation
First radiation out of x-ray tube
Primary Radiation
3 General types of occupational exposures that result in the highest dose to workers
Fluoro
Specials/Cardiovascular/Interventions
Mobile/Surgical
Emit flash of light in response to absorption of ionizing radiation
Scintillate
DEL Formula used today
1 x age = ___ rem
The difference between helium and alpha radiation
Alpha has zero electrons and a + 2 charge while, Helium has 2 electrons and no charge
SI unit for Roentgen
C/kg
SI unit for RAD
Gray
SI unit for REM (rem)
Sievert
Radiation exposure in air
Roentgen
Radiation exposure to Patient
RAD
Radiation exposure to worker
REM (mrem)
QF for X-ray, gamma, beta
1
QF for protons
2
QF for Thermal neutrons
5
QF for Fast neutrons
20
QF for Alpha Particles
20