Author/Authors :
de Voigt، نويسنده , , M.J.A. and Bacelar، نويسنده , , J.C. and Micek، نويسنده , , S.L. and Schotanus، نويسنده , , P. and Verhoef، نويسنده , , B.A.W. and Wintraecken، نويسنده , , Y.J.E. and Vermeulen، نويسنده , , P.، نويسنده ,
Abstract :
A novel Compton-suppression spectrometer has been designed and its performance has been tested experimentally. The device consists of a single BGO crystal with a cylindrical well that holds a Ge crystal without interfering material between the crystals. Both crystals are cooled to an equilibrium temperature of 104 K which allows a proper performance of the Ge detector. The BGO crystal is read out by a single PM tube. Photodiodes have been applied to investigate the light yield and timing properties of BGO at low temperature. The light transport phenomena were well reproduced by computer simulations. The photopeak-to-total ratio amounts to 0.74 with an average suppression factor of 10.1 for a 137Cs source and 0.60 and 6.4, respectively, for a 60Co source. These results are well reproduced by Monte Carlo codes simulating the γ-ray interactions, also taking into account some charge-collection inefficiency.
