A low-noise beta-radiometer
The two-channel detector for a low-noise (down to 0.06 sec{sup -1}) beta-radiometer for measuring the mass concentration of {sup 90}Sr in the environment after the chemical extraction of strontium by the oxalate-nitrate method was certified at the D.I. Mendeleev Institute of Metrology (certificate No. 137/93). A detector unit using two end-window self-quenching counters with thin input windows (8 {mu}m thick and 60 mm in diameter) operating as a Geiger-Mueller counter and filled with a mixture of 90% helium (atomic gas) and 10% ethanol (organic molecules) can measure the beta-activity of two substrates concurrently. It is often used to detect the beta-radiation of {sup 90}Sr. This isotope produces particles with energies ranging from 180 to 1000 keV, and the detection efficiency is 50% at a level of 0.1 Bq after measuring for 20 min with an uncertainty of 25%.
- OSTI ID:
- 232777
- Journal Information:
- Instruments and Experimental Techniques, Vol. 38, Issue 3; Other Information: PBD: Dec 1995; TN: Translated from Pribory i Tekhnika Eksperimenta; No. 3, 154-160(May-Jun 1995)
- Country of Publication:
- United States
- Language:
- English
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