Abstract:
A radiation detection device including a scintillation crystal in the form of a rod having photomultiplier devices affixed to either end which monitors the X-ray transmission characteristics of an object. Associated circuitry responds to the output signals developed by the photomultiplier tubes to map the transmission characteristics of the object. The use of a single rod-like scintillation crystal in combination with a pair of photomultiplier devices replaces the array of discrete simulator scintillation crystals typically employed to monitor objects for radiation emitting materials.
Abstract:
A camera tube in which input radiation information is directed onto a radiation-sensitive target or the input radiation is converted to electrons directed onto an electron-sensitive target and the information is read out from the opposite side of the target by means of a high-energy electron beam.
Abstract:
An electrode includes an electron or irradiation transmissive conducting layer and an electron-emissive layer of insulating material in spongy form. This layer may be of BaF2, LiF2, MgF2, MgO, Al2O2, CsI, KCl or NaCl and preferably has a density of only about 1% of the same material in bulk form, e.g. 0.01 to 0.1 gms. per cc. with a thickness of 10 to 100 m . The layer may be formed by deposition in a gaseous atmosphere, e.g. argon at 1 to 2 mm. of Hg pressure, with a spacing of about 3 inches between the evaporator and the receiver, which may be rotating. Alternatively magnesium may be burnt in air at atmospheric pressure about 14 inches from the receiver. The receiver may be an aluminium film supported by a metal ring and formed by vacuum deposition of aluminium on to a film of thermally removable cellulose nitrate to a thickness of 140 to 1000 . Specifications 792,507, 862,211 and 898,433 are referred to.