A novel radio guided surgery (RGS) technique for cerebral tumors using $beta^{-}$ radiation is being developed. Checking the availability of a radio-tracer that can deliver a $beta^{-}$ emitter to the tumor is a fundamental step in the deployment of
such technique. This paper reports a study of the uptake of 90Y labeled (DOTATOC) in the meningioma and the high grade glioma (HGG) and a feasibility study of the RGS technique in these cases.
$TeO_2$ crystals are used as bolometers in experiments searching for Double Beta Decay without emission of neutrinos. One of the most important issues in this extremely delicate kind of experiments is the characterization of the background. The knowl
edge of the response to $alpha$ particles in the energy range where the signal is expected is therefore a must. In this paper we report the results on the response function of a $TeO_2$ bolometer to $alpha$s emitted by $^{147}$Sm dissolved in the crystal at the growth phase. A Quenching Factor of ($1.0076pm 0.0005$) is found, independent of the temperature in the investigated range. The energy resolution on $alpha$ peaks shows a standard calorimeter energy dependence: $sigma; [rm{keV}] = (0.56 pm 0.02) oplus (0.010 pm 0.002)sqrt{E[rm{keV}]} $. Signal pulses show no difference between $alpha$ and $betagamma$ particles
