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Gamma-ray position-sensitive coaxial Ge(Li) detector

1974; Elsevier BV; Volume: 117; Issue: 1 Linguagem: Inglês

10.1016/0029-554x(74)90411-x

1878-3759

I. S. Sherman, M.G. Strauss,

Nuclear Physics and Applications

Abstract The position of a γ-ray interaction in a true coaxial Ge(Li) detector is given in polar coordinates. Slots cut through the peripheral n-layer contact parallel to the detector axis divide the detector into effectively independent wedge-shaped sectors. The angular position of interaction is obtained by noting the sector in which a γ-ray is detected. The radial distance is determined from the difference between the rise and fall times of the recovered current pulse obtained from the p-core. Radial fwhm resolution of 1 mm was obtained with a 122 keV γ-ray beam in a 50 mm diameter detector. Non-linearity is less than 0.5 mm. The radial response is independent of angle. The position-sensing characteristics of the detector and the operation of the radius-determining pulse-shape analyzer are discussed.