Module 3: Control of Radiological Work Flashcards
(27 cards)
What are five ways to reduce internal radiation exposure
- Reduce time exposed
- Adhere to Smoking Restrictions
- Wear PPE
- Consumption of food/bevs in approved areas only
- Maintain good personal hygeine
What are five ways to reduce external exposure
- Reduce time exposed
- Increase distance from source
- Use appropriate shielding
- Decay (lower dosage)
- Decontamination (clean suraces)
What is the purpose of a dosimeter?
To measure levels of radiation dose, and make sure its in safe limits
The location where a dosimeter badge (TLD) is to be worn on body, and when it must be worn
a TLD must be worn on trunk w/ face plate shown outwards. It must be worn in zones 2,3 and unzoned areas
What should you do if you lose your dosimeter?
- Stop work
- Backout of radioactive work area (RWA)
- Contact your RPC or supervisor
Where should a DCD (or EPD) be worn on the body and when?
worn on trunk within 10 cm of TLD and facing forward. It should be worn when worker is performing rad. work and entering RWA , prego workers in Z 2/3+unzoned , where recordable dose may be received.
Why must you submit a urine sample (bioassay)
To assign dose from tritium and detect other radionuclides in the body. Also needed to become DMS active and DMS inactive.
Required frequency for submitting bioassay and when you may be required to submit?
Submitted on either a 14 day, 28 day, or non-routine cycle.
Required if you perform radioactive work or are exposed to tritium or to become DMS active
What is the whole body counter for? When may you be required to do a whole body counter?
this measures gamma emitting radionuclides in the body.
incoming and exit WBC required to become DMS active/inactive
What is the required frequency for the whole body counter?
monthly - for fuel handling staff on a 14day Bioassay
quarterly - for non-fuel handling staff on 14day bio
annually - for staff on monthly bioassay
What is Zone 1
- no radioactive systems
- no loose contamination
- location of cafeteria
What is Zone 2
- may contain some radioactive systems
- potential for cross contamination from zone 3
- wear personal clothing or blue overall
What is Zone 3
- contains radioactive systems
- highest chance of contamination
What is Unzoned
- radioactive material may be transported through here
- free of contamination
Restrictions on transportation and consumption of food, drink, and prescription medication for each Zone
- non-urgent/non-prescription allowed in Zone 2,3 and unzoned or in lockers
- meds and fooonly CONSUMED in Zone 1 or public domain
What are restrictions for meds with rad. protective wear and exception for urgent meds
- can’t be carried if worker is wearing rad. protective clothing
- urgent meds need to be approved by wellness coordinator for CONSUMPTION in Zone 2,3 and unzoned areas
Requirements and restrictions for base layer clothing? (where and when to wear?)
- must be worn in zones 2,3 and unzoned
- during any contamination work
- when wearing a plastic suit
- when entering a rubber area/rubber change area
- wear underneath RPPE
What’s a Radioactive Work Area?
- an area where radioactive work is performed
- has defined boundaries and is posted with radiation hazard warning signs
What are the three types of waste?
Dry Solid, Tritiated Solid, Contaminated liquid waste
Where are the three types of waste placed?
Dry Solid: Green or Yellow bins
Tritiated Solid: in active waste bag or in a sealed white pail
Contaminated Liquid: collected and disposed in facility approved area
What is a Green waste bin for?
Clean(inactive) waste.
Found in zones 2 and 3
What is a Yellow waste bin for?
Active waste. Found in Zone 3 and Rubber Areas/
What restrictions apply to an O1 qual. person for radiation?
May not enter or do work independently in an area past a radiological sign
To do so, you need to know some RWA criteria and be supervised
What are common hazards in RWA?
(mrem exposure, airborne contamination, etc.)
External whole body exposure at around 2.5 mrem/hr.
airborne contamination greater than 1 MPCa
loos contamination
