| 摘要 |
The invention concerns an optical weighing method for measuring a DOI by- estimating the position (X) at the time of impact of a gamma photon in a crystalline medium, which has a juxtaposition of sections between which are created the conditions for a discrete energy loss of known magnitude, and wherein is compared the energy (El; E2) collected by photodetectors (4,- 5), mounted at longitudinal ends (2; 3) of said medium for estimating said position (X) in a given segment. The invention concerns a device including a photon detecting bar (1) including a single crystal extending along a longitudinal direction, including photodetectors at each end on flat surfaces perpendicular to said direction, It is characterized in that it includes a succession of single- crystalline bar lengths, homogeneous, isotropic and full, separated by dioptric mediums and/or openings parallel with said flat surfaces.
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