1,993 research outputs found
Combined pyrolysis and radiochemical gas chromatography for studying the thermal degradation of polymers
Pyrolysis gas chromatography and radioactive tracer techniques have
been used independently to study the thermal degradation of polymers. In
these laboratories the two techniques have been combined to elucidate
some of the mechanisms of the thermal degradation of epoxy resins and
polyimides. This paper describes the apparatus developed for this work
Radiochemical analysis of concrete samples from accelerator waste
For the decommissioning and disposal of shielding concrete from accelerator facilities, the Swiss Authorities require information on the radionuclide inventory. Besides the easy-to-measure γ-emitters 152Eu, 60Co, 44Sc, 133Ba, 154Eu, 134Cs, 144Ce, 22Na, also long-lived radionuclides emitting α- or β-radiation like 129I, 10Be, 36Cl, 239/240Pu and 238U have to be studied in order to obtain an overview to which extent they are produced and whether they represent a safety issue. In this study, we present the chemical separation and determination of selected radionuclides in shielding concrete from two different positions in the accelerator facilities at the Paul Scherrer Institute (PSI), the BX2 station, which was shut down in 1998, and the environment of the target M station, where the samples were taken in 1985 during reconstruction. The results of the measurements show that in no case the radionuclide content represents a safety risk. The components can be decommissioned corresponding to the Swiss safety regulation
Compilation of detection sensitivities in thermal-neutron activation
Detection sensitivities of the chemical elements following thermal-neutron activation have been compiled from the available experimental cross sections and nuclear properties and presented in a concise and usable form. The report also includes the equations and nuclear parameters used in the calculations
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