[en] A new solid-state detector for estimating the ¹⁰B content in vitro in biological tissues is developed. A new polymer composition is used as the detector. A linear dependence of the track quantity on the boron content in the range of its concentration 0.5-200 μg ¹⁰B/g in biological samples with the mass of 100-500 mg is presented. The recommendations on using the developed ¹⁰B detector in are formulated