Naslov
Određivanje niske aktivnosti Sr-90 na scintilacijskom spektrometru pomoću Čerenkovljevog brojenja
(The determination of low activity of 90Sr on scintillation spectrometer by means of Cherenkov counting)

Autori
Vitas, Biljana

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad

Fakultet
Prirodoslovno-matematički fakultet, Kemijski odsjek

Mjesto
Zagreb

Datum
10.07

Godina
1999

Stranica
48

Mentor
Vojković, Vlasta

Neposredni voditelj
Grahek, Željko

Ključne riječi
Sr-90 ; niska aktivnost ; scintilacijski spektrometar ; Čerenkovljevo brojenje
(Sr-90 ; low activity ; scintillation spectrometer ; Cherenkov counting)

Sažetak
The paper describes the possibility for fast determination of low activity 90Sr-90Y by scintillation spectrometer. The average level of background and efficiency of a low-level scintilation spectrometer for 90Sr-90Y by means of Cherenkov counting has been determined. The results of efficiency detection of 90Sr-90Y has been determined. The obtained result for aqueous solution was 45%, and in nitric acid solution was aproximately 50%. Efficiency of detection of 90Sr-90Y was constant for all tested concentration in solutions. The low-level detection for each solution has been determined and it has been found that as the efficiency of detection and time counting increase the low-level of detection decreases. Influence of colour and volume sample on efficiency of low-level scintillation spectrometer, by means of Cherenkov counting has been examined. The efficiency of detection raises together with solution volume until 10 ml, for bigger volumes the efficiency of detection 90Sr-90Y is constant and increase for the intensity of the colour makes the efficiency of detection lower. The possibility of detection of 90Sr-90Y in isotope mixture, by means of Cherenkov counting and by means of scintillation counting has been investigated. It has been found that the simple and exact determination of the low activity 90Sr in natural samples is possible by the Cherenkov efect. The “technique” with liquid scintillator (Insta gel) can be used for determination 89, 90Sr-90Y in mixture.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija

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