Elaboration of an analysis method on the basis of γ spectroscopy for traces of gadolinium in graphite. (Development of the procedure for routine analysis, optimization of detector and sample geometry, identification of detection limits)

Automatic translation: As an alternative to the second one labeled ''KLAK'' Organic, volatile gadolinium compounds have been proposed for the shutdown system of the high-temperature reactor (HTR) with spherical fuel elements (BE). These substances are introduced into the primary circuit of the HTR, vaporize and enter the helium flow with the Core. There they hit the graphitic BE down and are sorted by the graphite. This sorption process is to be investigated, among other things, by measuring the adsorption isotherms. With regard to the required changes in reactivity in the core of the HTR, the amount of each ball must be sorted gadoliniums can be controlled. previous estimates According to this, this amount is in the ug range, which is difficult and time-consuming to detect chemically and analytically.