InSb doped nith Mn offers an excellent integrated cryogenic detector for low-energy X-ray and k t a spectroscopy. It combines good properties from both spectroscopic point of view (higl atomic number) and lontemperature (LT) thermometry. The thennosensitivity is superiour over that of the most popular another bulk themlistor from neutron-transmutation-doped (NTD) Ge and its application is not restricted the severe technological aspects. The results of (magneto)resistivity versus temperature

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... and magnetic susceptibilie x(T) measurements. performed to clear up an unusial behaviour of conductivity at mK temperatures, are presented .