RADIATION SAFETY EXAM #1
QUESTIONS WITH CORRECT ANSWERS
What does DOT stand for? - Answer-(Department of Transportation)
determines labeling and packaging requirements. There are some important directions
and specific labeling when packaging radioactive materials as well as special receipt
procedures.
film badge - Answer-Detector that is a piece of radiation sensitive film that is housed in
a light and vapor proof envelope.
Pocket Dosimeter - Answer-a. Direct Read Pocket Dosimeter
Size and shape of a pen that contains a small ionization chamber
By pointing the instrument at a light source, the exposure reading is viewed on a
translucent scale which is shown in units of exposure.
b. Digital Electronic Dosimeter
Provides an immediate exposure readout (can be read while worn)
The electronic counter inside the dosimeter displays the accumulated exposure and
dose rate in digital form.
Thermo Luminescence Dosimeter (TLD) (Ring badge) - Answer-• Also known as a ring
badge
• Contains lithium fluoride crystals as sensing material. When ionizing radiation enters
the dosimeter, it generates free electrons and holes pair that can be trapped inside the
crystal material.
Optically Stimulated Luminescence (OSL) Dosimeter - Answer-• Similar to TLD ring
badges, however, these badges contain aluminum oxide crystals. When it is time to
assess the dose, the trapped electrons are freed by exposing the dosimeter to a laser or
LED light.
DOSE CALIBRATOR QC - CONSTANCY - Answer-• Performed DAILY, upon
installation, after repair or if the dose calibrator is relocated.
• Used to verify the dose calibrator is measuring radioactivity precisely.
• usually Cs-137
DOSE CALIBRATOR QC - LINEARITY - Answer-Performed Quarterly (every 3
months), upon installation, after repair or if the dose calibrator is relocated.
• Checks if the calibrator is able to accurately measure the correct activity over the
entire range of use.
• Test is done by using a vial or syringe of Tc-99m
DOSE CALIBRATOR QC - ACCURACY - Answer-• Performed ANNUALLY, upon
installation, after repair or if the dose calibrator is relocated.
, • Assesses the ability of a dose calibrator to provide a true measurement of isotope
frequently used.
• A total of 3 (or more) consecutive measurements of the reference source are taken.
Certification - Answer-ARRT:
NMTCB:
a process by which a nongovernmental organization grants recognition to an individual
who has met predetermine qualifications.
What are the 3 advisory groups? - Answer-International Commission on Radiological
Protection (ICRP)
International Commission on Radiation Units & Measurements (ICRU)
National Council on Radiation Protection (NCRP)
Gas Ionization Curve - Answer-In order from lowest to highest
1. Recombination Region
2. Ionization Region
3. Proportional Region
4. Limited Proportional Region
5. Geiger-Mueller Region
6. Self (Continuous) Discharge Region
Ionization region vs. GM region (gas ionization curve) - Answer-The ionization region
has a lower applied voltage than the Geiger-Mueller Region
What is the RSC? - Answer-Radiation Safety Committee
a group of individuals who are responsible for writing, editing and approving policies for
the entire hospital or medical center and is responsible for the use of all radioactive
materials under specific license conditions.
Who is the RSO? - Answer-radiation safety officer
an individual responsible for the day-to-day operation of an the radiation safety
program. Must have the appropriate qualifications and training experience.
What type of area is the hot lab? - Answer-Controlled
Rules in the hot lab - Answer--Wear laboratory coats or other protective clothing at all
times in areas where radioactive materials are used.
-Wear protective gloves at all times
-The use of tongs should be available when manipulating doses.
-Monitor hands and clothing for contamination after each procedure or before leaving
the area.
-Use syringe shield whenever practical
-Do not eat, drink, smoke, or apply cosmetics in any area where radioactive material is
stored or used.
-Always wear personnel monitoring devices
QUESTIONS WITH CORRECT ANSWERS
What does DOT stand for? - Answer-(Department of Transportation)
determines labeling and packaging requirements. There are some important directions
and specific labeling when packaging radioactive materials as well as special receipt
procedures.
film badge - Answer-Detector that is a piece of radiation sensitive film that is housed in
a light and vapor proof envelope.
Pocket Dosimeter - Answer-a. Direct Read Pocket Dosimeter
Size and shape of a pen that contains a small ionization chamber
By pointing the instrument at a light source, the exposure reading is viewed on a
translucent scale which is shown in units of exposure.
b. Digital Electronic Dosimeter
Provides an immediate exposure readout (can be read while worn)
The electronic counter inside the dosimeter displays the accumulated exposure and
dose rate in digital form.
Thermo Luminescence Dosimeter (TLD) (Ring badge) - Answer-• Also known as a ring
badge
• Contains lithium fluoride crystals as sensing material. When ionizing radiation enters
the dosimeter, it generates free electrons and holes pair that can be trapped inside the
crystal material.
Optically Stimulated Luminescence (OSL) Dosimeter - Answer-• Similar to TLD ring
badges, however, these badges contain aluminum oxide crystals. When it is time to
assess the dose, the trapped electrons are freed by exposing the dosimeter to a laser or
LED light.
DOSE CALIBRATOR QC - CONSTANCY - Answer-• Performed DAILY, upon
installation, after repair or if the dose calibrator is relocated.
• Used to verify the dose calibrator is measuring radioactivity precisely.
• usually Cs-137
DOSE CALIBRATOR QC - LINEARITY - Answer-Performed Quarterly (every 3
months), upon installation, after repair or if the dose calibrator is relocated.
• Checks if the calibrator is able to accurately measure the correct activity over the
entire range of use.
• Test is done by using a vial or syringe of Tc-99m
DOSE CALIBRATOR QC - ACCURACY - Answer-• Performed ANNUALLY, upon
installation, after repair or if the dose calibrator is relocated.
, • Assesses the ability of a dose calibrator to provide a true measurement of isotope
frequently used.
• A total of 3 (or more) consecutive measurements of the reference source are taken.
Certification - Answer-ARRT:
NMTCB:
a process by which a nongovernmental organization grants recognition to an individual
who has met predetermine qualifications.
What are the 3 advisory groups? - Answer-International Commission on Radiological
Protection (ICRP)
International Commission on Radiation Units & Measurements (ICRU)
National Council on Radiation Protection (NCRP)
Gas Ionization Curve - Answer-In order from lowest to highest
1. Recombination Region
2. Ionization Region
3. Proportional Region
4. Limited Proportional Region
5. Geiger-Mueller Region
6. Self (Continuous) Discharge Region
Ionization region vs. GM region (gas ionization curve) - Answer-The ionization region
has a lower applied voltage than the Geiger-Mueller Region
What is the RSC? - Answer-Radiation Safety Committee
a group of individuals who are responsible for writing, editing and approving policies for
the entire hospital or medical center and is responsible for the use of all radioactive
materials under specific license conditions.
Who is the RSO? - Answer-radiation safety officer
an individual responsible for the day-to-day operation of an the radiation safety
program. Must have the appropriate qualifications and training experience.
What type of area is the hot lab? - Answer-Controlled
Rules in the hot lab - Answer--Wear laboratory coats or other protective clothing at all
times in areas where radioactive materials are used.
-Wear protective gloves at all times
-The use of tongs should be available when manipulating doses.
-Monitor hands and clothing for contamination after each procedure or before leaving
the area.
-Use syringe shield whenever practical
-Do not eat, drink, smoke, or apply cosmetics in any area where radioactive material is
stored or used.
-Always wear personnel monitoring devices
