4πγ measuring device two NaI(Tl) well-type crystals for measuring the radioactivity of radionuclides with complex decay scheme
Description
A measuring set-up, consisting of two large-sized NaI(Tl) well-type crystals in 4 π arrangement, is described, which allows a quick and simple measurement of sources of those nuclides, whose gamma-ray transitions in the daughter nucleus are essentially cascading. To determine the activity only one measurement of the integral count-rate is required. The necessary total detection efficiency eta per decay of the nuclide under study is calculated. Uncertainties of the calibration and the decay data have only little effect on the uncertainty of the activity because of the high efficiency. Measurements of the activity performed on 110Agsup(m), 134Cs, 152Eu, 180Hfsup(m) and 182Ta led to uncertainties of 0.2% to 0.6% (1 sigma). In the appendix the computer program for the determination of eta is listed. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Es wird eine aus zwei grossen NaI(Tl)-Bohrlochkristallen in 4π-Anordnung bestehende Messapparatur beschrieben, die eine schnelle und einfache Messung der Aktivitaet von Quellen solcher Nuklide gestattet, bei denen die Gammastrahlen-Uebergaenge im Tochterkern im wesentlichen ueber Kaskaden verlaufen. Zur Bestimmung der Aktivitaet wird nur eine Messung der integralen Zaehlrate sowie der berechenbare Wert eta der nuklidbezogenen Gesamtnachweiswahrscheinlichkeit benoetigt. Unsicherheiten von Kalibrier- und Zerfallsdaten wirken sich wegen der hohen Nachweiswahrscheinlichkeit nur wenig auf die Unsicherheit der Aktivitaet aus. Aktivitaetsbestimmungen an 110Agsup(m), 134Cs, 152Eu, 180Hfsup(m) und 182Ta fuehrten zu Messunsicherheiten von 0,2 bis 0,6% (1 sigma). Im Anhang wird das Rechenprogramm zur Bestimmung von eta aufgelistet. (orig.)
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Additional details
Additional titles
- Original title (German)
- 4πγ-Messstand mit zwei NaI(Tl)-Bohrlochkristallen zur Aktivitaetsbestimmung von Radionukliden mit komplexen Zerfallsschema
Publishing Information
- Imprint Pagination
- 35 p.
- Report number
- PTB-Ra--10
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 11566135
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- ABSOLUTE COUNTING; ACCURACY; CESIUM 134; DAUGHTER PRODUCTS; EUROPIUM 152; FOUR-PI COUNTING; GAMMA CASCADES; GAMMA DECAY; HAFNIUM 180; ISOMERIC NUCLEI; NAI DETECTORS; SILVER 110; TANTALUM 182
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; COUNTING TECHNIQUES; DAYS LIVING RADIOISOTOPES; DECAY; ELECTRON CAPTURE RADIOISOTOPES; ENERGY-LEVEL TRANSITIONS; EUROPIUM ISOTOPES; EVEN-EVEN NUCLEI; HAFNIUM ISOTOPES; HEAVY NUCLEI; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MEASURING INSTRUMENTS; MINUTES LIVING RADIOISOTOPES; NUCLEAR CASCADES; NUCLEAR DECAY; NUCLEI; ODD-ODD NUCLEI; RADIATION DETECTORS; RADIOISOTOPES; RARE EARTH NUCLEI; SCINTILLATION COUNTERS; SECONDS LIVING RADIOISOTOPES; SILVER ISOTOPES; SOLID SCINTILLATION DETECTORS; STABLE ISOTOPES; TANTALUM ISOTOPES; YEARS LIVING RADIOISOTOPES