| Autor: |
Günter Herrmann, Gunnar Skarnemark, M. Mendel, F. Rocker, A. Nähler, Norbert Trautmann, N. Wiehl, U. Tharun, Klaus Eberhardt, K. Weiner, J. V. Kratz, J. Alstad, B. Wierczinski |
| Rok vydání: |
1996 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 370:532-538 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/0168-9002(95)00830-6 |
| Popis: |
A liquid-scintillation counting system has been developed for the internal measurement of α-particle energies and the detection of spontaneous fission events on-line in flowing organic solutions resulting from continuous rapid chemical separations by liquid-liquid extraction. The scintillator, dimethyl-POPOP and naphthalene dissolved in toluene, contains the extracting agent, di-(2-ethylhexyl-)-phosphoric acid or dibutylphosphate. An average α-energy resolution of 4,8% FWHM was measured in the energy range 4.78 to 7.69 MeV in stationary as well as flowing organic solutions. Additional features of they system are: (1) detection of spontaneous fission events by larger pulses than produced by α-particles; (2) suppression of interfering β- and γ-radiation by pulse shape discrimination and pile-up rejection; (3) identification of parent-daughter α-α- or α-fission-correlations in decay chains; (4) on-line α-energy calibration by spiking the organic phase with 3.96-s 219Rn-1.78-ms 215Po milked from a 227Ac source. In order to increase the detection efficiency, a unit with three detector cells in series was built and tested with 219Rn and 220Rn. An on-line model experiment for element 104 was carried out using the α-emitter 17-s 161Hf produced by nuclear fusion of samarium with neon and chemically separated by liquid-liquid extraction. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect