STE #10 Flashcards
Which of the following is a basic technique that can be used to reduce radiation exposure at a component or work site?
Remove the equipment or components to low dose areas whenever possible to perform work activities.
What dose reduction principle listed below would include flushing systems with clean water prior to starting work?
Decreasing source activity
Which of the following is a basic technique that can be used to reduce radiation exposure at a component or work site?
Prefabricate equipment, to the extent possible, outside the RCA before going to work.
Which of the following is used as a protective measure whenever work is performed in a High Contamination Area (HCA)?
Contain the high contamination to a small area, e.g. the internal surface of a system component, by wiping down or changing gloves frequently.
Which of the following is used as a protective measure whenever removing an item from a High Contamination Area (HCA)?
Wipe down or decontaminate the items inside the High Contamination Area
to acceptable contamination levels before they are removed from the area.
Which statement is true concerning use of Large Area Smears (LAS)?
LAS may be used to determine the presence of contamination, and give indication to track source of contamination.
When surveying an item for fixed and loose contamination, which statement is correct?
If an item has been surveyed to be free of removable contamination, all activity from a survey with a frisker will be fixed contamination.
Which of the following statements are true concerning monitoring items removed from a RCA?
If the item is small enough, a Small Articles Monitor (SAM) or Large Article Monitor (LAM) may be used to determine total contamination of the item.
In which situation below would extremity dosimeters be required?
The shallow dose equivalent to an extremity is likely to exceed twice the whole body dose and the shallow dose equivalent to an extremity will exceed the whole body dose by more than 500 mrem over the duration of the job
Which scenario would require relocation of a workers whole body dosimetry?
The highest dose rates in the work area are150 mrem/hour to the upper right arm of a worker and 120 mrem/hr to the chest of the worker. The job duration is 2 hours with only one RCA entry.
Dosimetry is required to be repositioned, or additional dosimetry added, if the dose rates are greater than 50 mrem/hr and it is likely that a portion of the whole body is anticipated to receive more than 100 mrem during the entry. True or False?
False
An individual is working on reactor coolant pump parts and the extremity dose rates are 800 mrem/hr beta and the whole body dose rate is 400 mrem/hr beta. The duration of the job is expected to be 1.5 hours.
Extremity dosimetry is required
During a pre-job brief the worker described his body position to be standing upright while working on a valve reading 200 mrem/hr contact and 140 mrem/hr at 30 cm. The duration of the job was to be 2 hours. However once the work started in the field the individual’s thigh was against the highest dose rate on the valve. When asked to move back the worker said he had to maintain that position to do the work. The RP Technician should take the following action.
Stop the job and notify RP Supervision about the change in body position in relationship to the sources.
If dose gradients are indicated during radiation surveys, it is important to know the body position of the workers to ensure that dose is being properly monitored. True or False?
True
While performing job coverage for the repair of a valve, you notice that the general area dose rates are 30% higher than what was briefed and the contact dose rate on the valve is twice the value. You should take the following action.
Stop work since the dose rates are higher than expected.
