Radiometric Flashcards
(50 cards)
What radiation field strength is proper for operation of PROTRAC detectors, in general?
0.05 to 1.5 mR/hr
Which source holder family can be loaded with more than a single source capsule?
SHLM
NORM is
Naturally occurring radioactive material
Per inch of vessel diameter, which application requires the highest source activity?
Density
40 inches is the practical maximum process path length for radiometric density measurement offered by VEGA because
Both source size and measurement resolution are the limiting factor
What benefit(s) does a radiometric process measurement provide?
Non - contact measurement
Maintenance free detectors
No process connection required
With the double encapsulation design of the source capsules, what can be said about their safety or design?
It is extremely unlikely for radioactive material to leak
On average, Americans receive about how much annual radiation dose just by living their everyday lives?
600 mREM/yr
What is the radiation specification for a typical source holder in North America?
5 mR/hr @ 1 foot
The Radiation Safety Principle known as “ALARA” stands for what?
As low as reasonably achievable
What are the 4 tools for Radiation Safety?
Time, Distance, Shielding, Planning
What is 1 of the 2 different types of licenses that a source holder can be distributed in the United States?
General or Specific licenses in the US
Radiometric continues level measurement is what type of measurement technique
an inferred
The ideal continuous level calibration linearizer should contain how many points?
5 to 10 gives good range
if you do more than 10 not providing a lot in your investment
less than 5 empty spots
True or False - Radiometric measurement systems are not accurate until a live calibration is performed on the process
True
When the level reading from a radiometric detector is in question, the first step should be:
Determine if the count rate change reliably indicates the process change
DO NOT just get in another liniarizer - or put in a new calibration point
Basic indisputable facts of radiometric measurement include:
Radiation doesn’t lie
infer measurement and the process value is determined based on the count rate
true for radiometric continuous level measurement:
Count rate is the foundation of the measurement
Radiometric systems tolerate high process pressures and temperatures
Calibration = linearization table
Advantage of VEGAs multi point density array system
They measure process density independently at each measurement point
a measurement error from one detector does not affect the other detectors from making measurements
Applications for Multi-Point Density Array system
Desalters (refining - separate the cruide oil from the water and salt)
Acid Settlers (HF) (refining- alkylation produces additive to increase octane rating of fuel)
Free water knockout vessels (3 phase separator)
reactor vessels - thick walled vessel, high temperatures and pressures
What benefit(s) does a radiometric process measurement provide?
Non-contact measurement
Maintenance free detectors
No process connection required
Radiometric continuous level measurement is _______ measurement technique
an inferred
VEGA radiometric solutions make use of which two isotopes:
cobalt 60 and cesium 137
In general, the proper radiation field strength for ProTrac detectors is:
0.05 to 1.5 mR/hr
