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Cerenkov counting and Cerenkov-scintillation counting with high refractive index organic liquids using a liquid scintillation counter

Abstract

/sup 18/F and /sup 14/C radioactivity was measured in methyl salicylate (MS), a high refractive index hybrid Cherenkov-scintillation generating medium, using a liquid scintillation counter. At concentrations of up to 21.4%, in MS, dimethyl sulfoxide (DMSO) quenched /sup 14/C fluorescence, and with a 10-fold excess of DMSO over MS, /sup 18/F count rates were reduced below that for DMSO alone, probably as a result of concentration-independent self-quenching due to 'dark-complex' formation. DMSO in lower concentrations did not reduce the counting efficiency of /sup 18/F in MS. Nitrobenzene was a concentration-dependent quencher for both /sup 14/C and /sup 18/F in MS. Chlorobenzene (CB) and DMSO were both found to be weak Cherenkov generators with /sup 18/F. Counting efficiencies for /sup 18/F in MS, CB, and DMSO were 50.3, 7.8 and 4.3% respectively in the coincidence counting mode, and 58.1, 13.0 and 6.8% in the singles mode. /sup 14/C efficiencies were 14.4 and 22.3% for coincidence and singles respectively, and 15.3 and 42.0% using a modern counter designed for coincidence and single photon counting. The high /sup 14/C and /sup 18/F counting efficiency in MS are discussed with respect to excitation mechanism, on the basis of quench and channels ratios changes observed.  More>>
Authors:
Wiebe, L I; Helus, F; Maier-Borst, W [1] 
  1. Deutsches Krebsforschungszentrum, Heidelberg (Germany, F.R.). Inst. fuer Nuklearmedizin
Publication Date:
Jun 01, 1978
Product Type:
Journal Article
Reference Number:
AIX-10-459525; EDB-79-106564
Resource Relation:
Journal Name: Int. J. Appl. Radiat. Isot.; (United Kingdom); Journal Volume: 29:6
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CHERENKOV COUNTERS; EFFICIENCY; LIQUID SCINTILLATION DETECTORS; PERFORMANCE; CARBON 14; DMSO; FLUORINE 18; SALICYLIC ACID; SCINTILLATION QUENCHING; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CARBON ISOTOPES; CARBOXYLIC ACIDS; EVEN-EVEN NUCLEI; FLUORINE ISOTOPES; HOURS LIVING RADIOISOTOPES; HYDROXY ACIDS; ISOTOPES; LIGHT NUCLEI; MEASURING INSTRUMENTS; NUCLEI; ODD-ODD NUCLEI; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; RADIATION DETECTORS; RADIOISOTOPES; SCINTILLATION COUNTERS; SULFOXIDES; YEARS LIVING RADIOISOTOPES; 440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
OSTI ID:
6154434
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: IJARA
Submitting Site:
INIS
Size:
Pages: 391-394
Announcement Date:

Citation Formats

Wiebe, L I, Helus, F, and Maier-Borst, W. Cerenkov counting and Cerenkov-scintillation counting with high refractive index organic liquids using a liquid scintillation counter. United Kingdom: N. p., 1978. Web. doi:10.1016/0020-708X(78)90017-0.
Wiebe, L I, Helus, F, & Maier-Borst, W. Cerenkov counting and Cerenkov-scintillation counting with high refractive index organic liquids using a liquid scintillation counter. United Kingdom. doi:10.1016/0020-708X(78)90017-0.
Wiebe, L I, Helus, F, and Maier-Borst, W. 1978. "Cerenkov counting and Cerenkov-scintillation counting with high refractive index organic liquids using a liquid scintillation counter." United Kingdom. doi:10.1016/0020-708X(78)90017-0. https://www.osti.gov/servlets/purl/10.1016/0020-708X(78)90017-0.
@misc{etde_6154434,
title = {Cerenkov counting and Cerenkov-scintillation counting with high refractive index organic liquids using a liquid scintillation counter}
author = {Wiebe, L I, Helus, F, and Maier-Borst, W}
abstractNote = {/sup 18/F and /sup 14/C radioactivity was measured in methyl salicylate (MS), a high refractive index hybrid Cherenkov-scintillation generating medium, using a liquid scintillation counter. At concentrations of up to 21.4%, in MS, dimethyl sulfoxide (DMSO) quenched /sup 14/C fluorescence, and with a 10-fold excess of DMSO over MS, /sup 18/F count rates were reduced below that for DMSO alone, probably as a result of concentration-independent self-quenching due to 'dark-complex' formation. DMSO in lower concentrations did not reduce the counting efficiency of /sup 18/F in MS. Nitrobenzene was a concentration-dependent quencher for both /sup 14/C and /sup 18/F in MS. Chlorobenzene (CB) and DMSO were both found to be weak Cherenkov generators with /sup 18/F. Counting efficiencies for /sup 18/F in MS, CB, and DMSO were 50.3, 7.8 and 4.3% respectively in the coincidence counting mode, and 58.1, 13.0 and 6.8% in the singles mode. /sup 14/C efficiencies were 14.4 and 22.3% for coincidence and singles respectively, and 15.3 and 42.0% using a modern counter designed for coincidence and single photon counting. The high /sup 14/C and /sup 18/F counting efficiency in MS are discussed with respect to excitation mechanism, on the basis of quench and channels ratios changes observed. It is proposed that MS functions as an efficient Cherenkov-scintillation generator for high-energy beta emitters such as /sup 18/F, and as a low-efficiency scintillator for weak beta emitting radionuclides such as /sup 14/C.}
doi = {10.1016/0020-708X(78)90017-0}
journal = {Int. J. Appl. Radiat. Isot.; (United Kingdom)}
volume = {29:6}
journal type = {AC}
place = {United Kingdom}
year = {1978}
month = {Jun}
}