Energy calibration of the NaI(Tl) calorimeter of the SND detector using   cosmic muons
  The general purpose spherical nonmagnetic detector (SND) is now taking data at VEPP-2M $e^+e^-$ collider in BINP (Novosibirsk) in the centre of mass energy range of $0.2 \div 1.4$ GeV. The energy calibration of the NaI(Tl) calorimeter of the SND detector with cosmic muons is described. Using this method, the energy resolution of $5.5 % (\sigma)$ for 500 MeV photons was achieved. 
M.N.Achasov, A.D.Bukin, D.A.Bukin, V.P.Druzhinin, V.B.Golubev,   V.N.Ivanchenko, S.V.Koshuba, S.I.Serednyakov