STE #2 Flashcards
If you are entering an area of unknown dose rates you should set you instrument:
Highest scale for the expected dose rates
If you are surveying a drum and you find a spot reading 140 mrem/hr on contact you should also
Take a 30 cm reading
If you are doing a survey and you find a dose rate of 100 mrem/hr just above the knee what action should you take.
Perform a gradient dose rate survey
Which of the following instruments is most commonly used for obtaining general area radiation dose rates
Ion chamber
While performing a survey on a floor drain you obtain the following data; open window 22 mrem/hr, closed window, 6 mrem/hr. The instrument has a beta
factor of 4. What is the contact beta dose rate?
64 mrad/hr
When documenting a gradient dose rate survey you should include the dose rates at the head, chest, waist and knee level. True or False?
True
Which of the following should be considered as a potential source of radiation
- Pipes,
- Elbows,
and 3. Bottom of tanks
To measure the effectiveness of dosimetry, dose rates should always be obtained and documented. True or False?
At chest level
A closed window reading on a ion chamber is only measuring beta dose rates. True or False?
False
When should beta dose rates be taken
- On surfaces with contamination levels >500,000 dpm/100 cm^2,
- On open reactor coolant system,
and 3. Entry into the refueling canal
When is a survey required to be performed in the overhead?
When access is required above 7 feet and access is provided by ladders
Gaps in shielding could cause a high radiation field and should always be surveyed. True or False?
True
The background limit for being able to perform a free release survey is…
200 cpm
To perform a direct frisk for alpha contamination, which of the following instruments would be the best to select…
Zinc sulfide
When performing a direct frisk survey with a pancake GM detector the probe should be moved no more than
1-2 inches per second
If using a GM frisker and the meter is indicating greater than 50,000 ncpm, the technician should survey for the potential
Discrete particles
When performing a direct frisk with an alpha survey instrument the probe to surface distance should be ______________.
¼ inch away
The background count rate for using an alpha survey meter to perform a direct frisk of items for free release cannot exceed ___________cpm
1
While performing a survey of a Large Area Smear (LAS) you see a rapid drop in the count rate as the probe is slowly moved by one inch. This could be an
indication you have found ______________.
Discrete Radioactive Particle (DRP)
When performing a smear survey with a disc smear the surface area surveyed should be which of the following?
100 cm 2
When surveying a discrete particle with an ion chamber and you obtain an OW/CW ration of less than 10, indicates the particle is which of the following.
Fuel Fragment
Wet or oily smears can result in significant self-absorption of when counting smears for alpha contamination. True or False?
True
You have performed a survey in an area posted as an Alpha Level 3. What percentage of smears should be counted for alpha contamination?
At least 50%
You have counted a contamination smear survey and the beta-gamma to alpha ratio is 1800/1. This indicates the area is which of the following
Alpha Level 2
An area where 90% of the exposure an individual receives can come from internal exposure is which of the following?
Alpha Level 3
When is alpha frisking required for personnel monitoring?
When the βγ/α Ratio is less than or equal to 50 and the total transuranic alpha is greater than or equal to 20 dpm/100 cm^2
You should immediately notify RP Supervision when which of the following occurs?
- Changes in radiological conditions that require changes in postings,
- Changes in radiation conditions that require changes in RWP controls,
and 3. Discovery of radioactive material outside the RCA
The proper way to document on a radiation survey the location of neutron dose rate of 50 mrem/hr would be 50 N at the location where the dose rate was taken. True or False?
True
