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We present a description of the originally developed $\beta$-spectrometerconsisting of two Si(Li)-detectors with sensitive area thickness above 8~mm and$4\pi$-geometry. The full absorption spectrometer allows for directmeasurements of $\beta$-spectra, disregarding the corrections to the responsefunction induced by the electron backscattering from the crystal surface. Incase of $\beta$-spectra of transitions to the excited state of the daughterisotope additional 3" BGO-detector is used in order to detect the$\gamma$-quanta in coincidence with the pair of Si(Li)-spectrometers.

Silicon $4\pi$ spectrometer for $\beta$-decay electrons with energies up to 3~MeV