Low-Background Measurements of 22Na in Natural Waters of Krasnodar Krai

Low-Background Measurements of 22Na in Natural Waters of Krasnodar Krai

Gamma spectrometers with 100 × 100 mm NaI(Tl) and 200 × 100 mm CsI(Tl) crystals for detecting annihilation radiation of β^sup +^ radionuclides are described. Two spectrometers are located in a surface laboratory and one underground, at a depth of 500 m of water equivalent, in Novorossiisk. The backg...

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Veröffentlicht in:Atomic energy (New York, N.Y.) N.Y.), 2004-01, Vol.96 (1), p.57
Hauptverfasser: Nevinskii, I O, Tsvetkova, T V, Zheleznyak, G S
Format: Artikel
Sprache:eng
Schlagworte:
Crystals
Gamma rays
Measuring instruments
Natural waters
Radiation
Seasonal variations
Spectrometers
Spectrum analysis
Studies
Volcanoes
Water depth
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Zusammenfassung:Gamma spectrometers with 100 × 100 mm NaI(Tl) and 200 × 100 mm CsI(Tl) crystals for detecting annihilation radiation of β^sup +^ radionuclides are described. Two spectrometers are located in a surface laboratory and one underground, at a depth of 500 m of water equivalent, in Novorossiisk. The background characteristics and the detection efficiency are presented for different operating modes of the coincidence system and for samples with different mass. A coincidence scheme in which all events with coincidences of pulses in both crystals and energy released in each detector are detected, making it possible to raise the ^sup 22^Na detection efficiency by approximately 30%, was tested. The results of measurements of the ^sup 22^Na content in some natural waters in Krasnodar krai, including in mud volcanoes, are presented. They show large seasonal variations.[PUBLICATION ABSTRACT]
ISSN:1063-4258
1573-8205
DOI:10.1023/B:ATEN.0000022815.92876.fb