Arrangements for detectors of radiation

• US 4,181,856 A
• Filed: 02/27/1978
• Issued: 01/01/1980
• Est. Priority Date: 03/24/1977
• Status: Expired due to Term

• Current Assignee: Thorn EMI Patents Limited
• Original Assignee: EMI (Entegris Incorporated)
• Inventors: Bone, Phillip R.
• Primary Examiner(s): Willis, Davis L.
• Application Number:
  US05/881,814
• Time in Patent Office: 673 Days
• Field of Search: 250/361 R, 250/366, 250/367, 250/369, 250/445 T
• US Class Current: 250/370.09
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: G01T 1/20182 Modular detectors, e.g. tiled scintillators or tiled photodiodes stacked detectors G01T1/20181
• CPC Class Codes: G01T 1/20185 Coupling means between the photodiode and the scintillator, e.g. optical couplings using adhesives with wavelength-shifting fibres
• CPC Class Codes: G01T 1/20189 Damping or insulation against damage, e.g. caused by heat or pressure

Abstract

An ionizing radiation detector arrangement includes scintillator crystals and respective photodiodes of elongate form and mountings to assemble these in sub-arrays of, for example, four, units. The mountings are shaped to permit assembly around a ring with radially extending cards bearing circuit components. Assembly is made accurately by including skewed lugs in the mountings.

Claims

1. An arrangement for detecting ionising radiation including a plurality of scintillator crystals, a plurality of photo-diodes, the crystals being secured to, and in direct optical communication with, respective ones of said photo-diodes, to form a plurality of detectors adapted to produce electrical output signals in response to ionising radiation incident on said crystals, a plurality of detector holders each constructed to receive a respective pair of said detectors and to support said detectors in side-by-side relationship with adjacent edges of the respective crystals in contact, a locating block constructed to receive said holders and to locate the respective detectors supported by said holders with the crystals of all adjacent detectors in contact, presenting a substantially uninterrupted receiving surface to said ionising radiation, said locating block being formed with projecting lugs for location of the complete assembly in relation to other similar assemblies.