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Biodex Medical Systems, Inc. © 2016 191
Moly Break-Through Test
Used to determine the percentage of parent Mo-99 remaining in the eluent containing the
daughter Tc-99m radionuclide.
Molybdenum-99 (Mo-99)
The parent radionuclide which decays into the daughter Tc-99m, used to generate
radiopharmaceuticals.
NIST
National Institute of Standards & Technology, whose activities include maintaining radioactive
material standards.
NRC
Nuclear Regulatory Commission, which is the agency of the Federal Government which
regulates radioactive materials.
Range Selection
The Atomlab unit automatically selects which range of display units
(µCi, mCi or Ci or MBq or GBq) to be used for the activity display to show activity values with
the most significant number of digits.
Response, Ionization Chamber
The variation of the ion current collected by an ionization chamber because of individual decay
processes associated with different radioisotopes. Calibration values (Dial Value) are required to
adjust the output of the electrometer for each radioisotope to compensate for this variation in
response, thereby ensuring accuracy over the entire range of commonly used radioisotopes.
Sleeve Shield
A method of performing linearity tests on a dose calibrator by encircling a single source with
leaded sleeves of varying thickness, thereby reducing the activity the dose calibrator measures
by a known amount. Comparison of the expected and actual activity values constitutes the test
of linearity.
Source Decay
A method of performing linearity tests on a dose calibrator by measuring the initial activity of a
source, accurately calculating its decayed activity at prescribed time intervals, and making
activity measurements at those time intervals. Comparison of the calculated and actual activity
values constitutes the test of linearity.
Traceability
Refers to using sources for calibrating a dose calibrator whose activities can be traced to the
National Institute of Standards & Technology.
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