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16 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the NRC requirement for calibration of survey meters?
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annual calibration
2 readings on each scale should be within 10% of reference source what happens if it is greater than 10%? |
either it is time for a new survey meter or it has to be used with a correction factor
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What should be done on a daily check of a survey meter?
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check battery and dedicated check source, should be within plus/minus 20% of ref source
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How sensitive is a well counter required to be?
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must be able to detect the presence of 2000 dpm/100 sq. cm
a known radioactive source must be used to convert sample measurements from cpm to dpm |
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What are the recommended action levels for unrestricted areas for high and low energy level radiation sources and then for restricted areas in dpm/100 sq cm?
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High Lower
unrestricted 200 2000 restricted 2000 20000 |
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How do we know the well counter we are using is sensitive enough to perform a wipe test?
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must be able to detect the presence of 2000 dpm/100 sq. cm
a known radioactive source must be used to convert sample measurements from cpm to dpm |
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When a well counter is checked against a reference source it should be plus or minus what percentage to be determined accurate?
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5%
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Sealed sources must be wipe tested how often?
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every 6 months
how sensitive must the detector be? and what must the level of contamination be under? |
be sensitive enough to count .005 uCi
and level of contamination must be below .005 uCi |
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What is the acceptable limit in CPM when testing a Cobalt 57 flood source?
3 steps to answering this question |
1. count of 102050 DPM
source count of 88988 what is the efficiency |
87.2%
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Step 2 of testing Cobalt 57 source. knowing the eff of 87.2 % we know the acceptable limit is .005 uCi, what is this in DPM?
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.005 uCi x 2.22 X10E6 DPM/uci =
11100 now 3. correct for efficiency what is the count limit for the source to be acceptable? |
87.2 x 11100 = 9679 cpm
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Packages must be suveyed and logged within _______ of delivery during normal department hours or within ________ if received after working hours
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Packages must be suveyed and logged within 3 hours of delivery during normal department hours or within 18 hours if received after working hours
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For a white I label the surface reading must be _______ and the TI is ____
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For a white I label the surface reading must be <0.5 mR/hr and the TI is N/A
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For a Yellow II label the surface reading should be ___________ mR/hr and the TI = _____
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For a Yellow II label the surface reading should be 0.5 mR/hr - 50 mR/hr and the TI = 1.0
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For a Yellow III label the surface reading should be ___________
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For a Yellow III label the surface reading should be 50 mR/hr - 200 mR/hr
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What is the TI?
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the mR/hr at 1 meter
what is the max per vehicle? |
50
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Surface contamination wipe test for packages must be below ____________________
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Surface contamination wipe test for packages must be below 0.01 uCi (22.000 dpm/100 sq. cm)
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For package return what is the level below which labeling is not required?
For Tc99m, for I-131? |
Tc-99m 1mCi
I-131 0.1 mCi |
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