STE #3 Flashcards
When is a radiological air sample required to be taken?
- During opening of a radioactive system which is known to cause airborne
activity,
and 2. Grinding on a contaminated surface
Air samples are required any time respiratory protection is being used for radiological purposes. True or False?
True
An air sample should be taken for which of the following…
Entry into an area with a known steam leak at a BWR
Air samples should always be taken in alpha level 1 areas. True or False?
False
Air sample should be taken in areas with removable contamination which could become suspended and airborne. Normally that would include areas with __________ dpm/100 cm2.
100,000
A significant spill of contaminated water is a reason to take a radiological air sample. True or False?
True
Grab samplers are used for the following purposes
- Determine peak airborne concentrations,
- Monitor air borne activity over short duration jobs.
and 3. Determine airborne activity when opening systems
A low volume air sampler should be used if the duration of the potentially airborne generating activity is going to last longer than _________.
60 min
When using sample heads attached to hose for remote sampling it is important to verify what?
That the unit has been calibrated with that length of sample hose
When using silver zeolite to sample for iodine the atmosphere cannot contain which of the following below?
Hydrogen
If cracks are noticed on the o-rings of an air sample head it should be removed from service or the o-rings replaced. True or False?
True
Do not place the air sampler on contaminated surfaces of __________ where the discharge from the air sampler could generated air borne activity.
10,000 dpm/100 cm2
The minimum sample volume for a personal air sample is
No limit
For sampling transuranic isotopes such as AM-241, a minimum sample volume of ___________ should be obtained
1000 liters
One method to sample noble gas is to run a high volume air sample with a silver zeolite cartridge inside. True or False?
False
To sample noble gas using the water displacement method, obtain a marinelli beaker full of water and take to the area suspected of having noble gas. Remove the lid and pour out the water into a floor drain and seal the container again with
the lid. Record the required information for the sample.
True
To obtain the total DAC fraction of an air sample you would
Add the DAC fractions for each of the identified isotopes including alpha
Using the equations below, calculate the DAC fraction of an air sample with ncpm of 1200 and a counting efficiency of 15%. The volume of the sample s 800 liters.
1 liter is equal to 1000 ml.
.45 DAC
Using the equation below, calculate the DAC fraction of an air sample with 480 gross counts with a background of 50 counts. The counting equipment efficiency is 10% and the sample volume is 1000 liters.
1 liter is equal to 1000 ml
.193 DAC
Using the equation below, calculate the DAC fraction of an air sample with gross counts of 3600 and a background of 180. The counting instrument efficiency is 8% and the volume of the air sample is 1200 liters.
1 liters = 1000 ml
.71 DAC
An area should be posted as Airborne Radioactivity Area, RP Brief Required for Entry, if the air sample results exceed 30% of DAC of noble gas. True or False?
False
Work in an alpha level 3 requires the use of personal air samplers. True or False?
True
When using a lapel air sampler, the sample head should be at what distance
from the workers nose and mouth?
10 inches
A lapel air sample was counted and indicated a total of 42% of a DAC. The area should be posted as an Airborne Area based on the results of this sample.
False
An air sample has been counted and indicates 58% DAC of Co-60. Which of the following actions should be taken.
Post the area as Airborne Radioactivity Area, RP Brief Required for Entry
If a Continuous Air Monitor (CAM) goes into alarm, and work in the area would not seem to be the cause of an airborne condition, the technician should perform which of the following below?
Check the background dose rates around the CAM to determine if an increase in dose rates has caused the alarm
A Continuous Air Monitor has an automatic alarm that sounds when a predetermined set point has been reached. True or False?
True
An air sampler should not be operated a potential explosive atmosphere of
_________ Lower Explosive Limit (LEL).
2-4%
When removing the sample media from the sample head, great care must to be
taken not to cross contaminate the sample. True or False?
True
When obtaining a particle and iodine sample, which sample media is placed first
in the air flow?
Particulate
Which of the following is not an appropriate use for a grad sample
For work with a long duration where a peak concentration is not expected.
If respiratory protection is used an air sample should be taken to validate the protection factor for the respirator being used. True or False?
True
Air sampling would be required in which of the following situations.
Alpha contamination is suspected inside a system but the concentration of alpha contamination is unknown. The system will be opened for maintenance.
Which of the following would require an air sample to be taken prior to the individuals being allowed to enter the area.
- PWR containment at power,
- BWR drywell at power,
and 3. Entering steam generators many ways
Which of the following is not a classification/type of air sample
Alpha zone
Which of the following is an action that should be taken if a Continuous Air Monitor (CAM) goes into alarm.
If the work activity is causing an increase in airborne radioactivity in the area, stop the work and evacuate workers from the immediate area.
- To obtain a noble gas sample using the wave method, you should open the Marinelle and wave the container in the atmosphere for which of the following
15-30 seconds
- If a CAM has went into alarm, and air samples do not indicate any airborne radioactivity, which of the following could be the most likely cause?
Background radiation levels have increased
Alpha analysis should be performed on particulates air samples under which of the following conditions.
The alpha to beta ratio is > 30,000 to 1
To document the use of a lapel air sample which of the following is required?
- Flow rate,
- Start and Stop time,
and 3. Individuals name
