2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153280A scintillation proportional counter with wavelength shifting fiber readout filled with Xe or Kr under a pressure of up to 20 atm is proposed for the low-background experiments on search for dark matter of the Universe and 2K-decay of 78 Kr.LaTeX 9 pages, 4 figures in EPS formatInstrumentation and DetectorsAstrophysicsHigh Energy Physics - Experimenttext