Method and apparatus for determination of sample homogeneity in scintillation counting
Patent
·
OSTI ID:5889901
A method for ascertaining radiochemical homogeneity in a liquid scintillation sample reliably identifies inaccurate geometries is disclosed so that meaningful activity counts can be determined. The novel method involves measuring the activity level of a set of homogeneous quench standard to obtain quench indicating parameter, or the Spectral Index of the External standard (SIE). The endpoint of each standard sample is computed allowing the formation of a table so that a calibration curve for each radionuclide of interest can be computed. The activity level of the unknown sample is then measured and the SIE determined so that an endpoint can be calculated. Finally, the theoretical endpoint obtained from a calibration curve is compared to the computed endpoint; if the computed endpoint of the sample deviates by more than 4% for tritium and 5% for higher energy radionuclides from the theoretical endpoint, the sample is considered to be nonhomogeneous or heterogeneous. An external standard-type liquid scintillation counting system is disclosed which automatically determines sample homogeneity, and it includes a microprocessor in its control system. The steps of the present invention and incorporated into the programmed steps for the microprocessor such that nonhomogeneous or heterogeneous samples are automatically identified on the readout of the system for an investigator.
- Assignee:
- Packard Instrument Company, Inc.
- Patent Number(s):
- US 4555629
- OSTI ID:
- 5889901
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
COMPUTERS
CONTROL SYSTEMS
COUNTING TECHNIQUES
ELECTRONIC CIRCUITS
ISOTOPES
LIQUID SCINTILLATION DETECTORS
LIQUID SCINTILLATORS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
PHOSPHORS
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
SCINTILLATION COUNTING
SPECIFICATIONS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
COMPUTERS
CONTROL SYSTEMS
COUNTING TECHNIQUES
ELECTRONIC CIRCUITS
ISOTOPES
LIQUID SCINTILLATION DETECTORS
LIQUID SCINTILLATORS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
PHOSPHORS
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
SCINTILLATION COUNTING
SPECIFICATIONS