Performance of a large hyperpure germanium detector array for in-vivo detection of low-energy photon and x-ray emitters: analytical procedure and current capabilities
The ORNL Whole Body Counter is one of the few in the country that is capable of assessment of body burdens of low-energy photon and x-ray emitters. This requires detectors and electronics specific for the task. Isotope identification and quantification capabilities are crucial at the facilities which deal with quantities of many radionuclides. The standard procedure for whole counting done at ORNL employs a 13.34 cm-dia. phoswich, a hyperpure germanium (HPGe) array consisting of six detectors totaling 80 cm/sup 2/, and a 23 cm by 23 cm NaI detector positioned under the subject's back. Isotope identification and quantification capabilities for detection of the actinides using the HPGe array are greatly improved over the phoswich system, making the HPGe detector an integral part of lung counting operations at ORNL. The HPGe array has been fully operational since May 1980. Since that time, calibrations have been performed with various sources, a calibration curve derived, and minimum significant measured activity (MSMA) and minimum detectable true activity (MDTA) for various radionuclides have been determined. The current analysis techniques are discussed, examples of MSMA and MDTA for various isotopes are given, and the derivation of a universal calibration curve for preliminary estimation of body burden is discussed using data acquired by the HPGe array.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6007052
- Report Number(s):
- ORNL/TM-7925; ON: DE82000443
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
560161 -- Radionuclide Effects
Kinetics
& Toxicology-- Man
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BODY
BODY BURDEN
CALIBRATION
ELECTROMAGNETIC RADIATION
EMISSION
GE SEMICONDUCTOR DETECTORS
HIGH-PURITY GE DETECTORS
IONIZING RADIATIONS
ISOTOPES
LUNGS
MEASURING INSTRUMENTS
NAI DETECTORS
NATIONAL ORGANIZATIONS
ORGANS
ORNL
PERSONNEL
PHOTON EMISSION
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
RESPIRATORY SYSTEM
SCINTILLATION COUNTERS
SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WHOLE-BODY COUNTERS
X RADIATION
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
560161 -- Radionuclide Effects
Kinetics
& Toxicology-- Man
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BODY
BODY BURDEN
CALIBRATION
ELECTROMAGNETIC RADIATION
EMISSION
GE SEMICONDUCTOR DETECTORS
HIGH-PURITY GE DETECTORS
IONIZING RADIATIONS
ISOTOPES
LUNGS
MEASURING INSTRUMENTS
NAI DETECTORS
NATIONAL ORGANIZATIONS
ORGANS
ORNL
PERSONNEL
PHOTON EMISSION
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
RESPIRATORY SYSTEM
SCINTILLATION COUNTERS
SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WHOLE-BODY COUNTERS
X RADIATION