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[en] The TRIGA Mark-II reactor of the 'Jozef Stefan' Institute can be operated in the pulse mode. During a pulse, radioactive gases (Ar-41, N-16 and O-19) are produced in the reactor coolant by neutron-induced nuclear reactions. These gases propagate through the reactor water column towards the reactor platform. An analysis of different contributions to the gamma radiation on the platform after the pulse generation was performed. The time development of the absorbed dose-rate was measured with a high-pressure ionization chamber and the gamma-ray spectra were recorded with a high-resolution n-type HPGe spectrometer and a low-resolution NaI(Tl) spectrometer. The spectra were recorded in several consecutive short-time intervals after the pulse in order to determine the time dependence of individual contributions of different radionuclides to the observed dose-rate. The results of the measurements are presented and a plausible explanation of the mechanisms behind the observed dose-rate time development is offered. (author)
Source
Ravnik, M.; Zagar, T. (Nuclear Society of Slovenia (Slovenia)) (eds.); Nuclear Society of Slovenia, Ljubljana (Slovenia). Funding organisation: Inst. Jozef Stefan, Ljubljana (Slovenia); NUMIP, Krsko (Slovenia); Ministry of Education, Science and Sport of Slovenia, Ljubljana (Slovenia); Westinghouse Electric Systems Europe S.A., Brussels (Belgium); Framatome, Paris (France); Agency for Radwaste Management, Ljubljana (Slovenia); Inetec, Zagreb (Croatia); Elmont, Krsko (Slovenia); Slovenian Nuclear Safety Administration, Ljubljana (Slovenia); Inst. of Metals and Technology, Ljubljana (Slovenia); Inst. of Metal Constructions, Ljubljana (Slovenia); Q Techna, Krsko (Slovenia); Faculty of Mechanical Engineering, Univ. of Ljubljana (Slovenia); Graduate Program Nucelar Engineering, Univ. of Ljubljana (Slovenia); 827 p; ISBN 961-6207-21-0; 
; 2003; [8 p.]; International Conference Nuclear Energy for New Europe 2003; Portoroz (Slovenia); 8-11 Sep 2003; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 3 refs., 3 tabs., 10 figs.
; 2003; [8 p.]; International Conference Nuclear Energy for New Europe 2003; Portoroz (Slovenia); 8-11 Sep 2003; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 3 refs., 3 tabs., 10 figs.