Coincidence sum peak assay of /sup 125/I activity using solid-state detectors

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Med. Phys.; (United States)

OSTI ID:5012115

Ling, C C; Biggs, P J

The use of solid-state detectors in the coincidence sum peak technique of /sup 125/I activity assay has been studied. The improved energy resolution of these detectors allows distinct resolution of the K..cap alpha.., K..beta.., and ..gamma.. peaks, and four sum peaks resulting from the coincident detection of the different X and ..gamma.. photons. Theoretical considerations yield three separate equations, each of which can be used, in conjunction with the experimental sum peak spectrum, to give the activity of the /sup 125/I sample in question. This method is suitable for calibration of /sup 125/I activities in the range of 0.01--0.5 ..mu..Ci (1 Ci=3.7 x 10/sup 10/ Bq) with precisions of 2%--3%.

• Research Organization: Division of Radiation Biophysics, Department of Radiation Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114
• OSTI ID: 5012115
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 7:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
ACTIVITY LEVELS
BETA DECAY
BETA DECAY RADIOISOTOPES
CALIBRATION
CHEMICAL ANALYSIS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RESOLUTION
ERRORS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
NAI DETECTORS
NUCLEI
ODD-EVEN NUCLEI
QUALITATIVE CHEMICAL ANALYSIS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION DETECTORS
RADIOISOTOPES
RADIOMETRIC ANALYSIS
RESOLUTION
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS