Scintillating substance and scintillating wave-guide element

Scintillating material based on a silicate crystal comprising lutetium (Lu) and cerium (Ce) characterised in that it contains oxygen vacancies ¤ at the quantity not exceeding 0.2 f.u. and its chemical composition is represented by the formula

• Lu1−yMeyA1−xCexSiO5−z¤z
• where
• A is Lu and at least one element selected from the group consisting of Gd, Sc, Y, La, Pr, Nd, Sm, Eu, Tb, LDy, Ho, Er, Tm, Yb,
• Me is at least one element selected from the group consisting of H, Li, Be, B, C, N, Na, Mg, Al, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Cs, Ba, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, U, Th,
• x is a value between 1×10−4 f.u. and 0.2 f.u.,
• y is a value between 1×10−5 f.u. and 0.05 f.u.,
• z is a value between 1×10−5 f.u. and 0.2 f.u.

Scintillating material based on a silicate crystal comprising cerium (Ce), characterised in that it contains fluorine (F) and its composition is represented by the chemical formula

• A2−x−yMeyCexSiO5−iFi
• where
• A is at least one element selected from the group consisting of Lu, Gd, Sc, Y, La, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb,
• Me is at least one element selected from the group consisting of H, Li, Be, B, C, N, Na, Mg, Al, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Cs, Ba, Hf;
• Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, U, Th,
• x is a value between 1×10−4f.u. and 0.2 f.u.,
• y is a value between 1×1−5 f.u. and 0.05 f.u.,
• i is a value between ×10−4 f.u. and 0.2 f.u.