Scintillation Camera

Abstract

A new and more sensitive gamma‐ray camera for visualizing sources of radioactivity is described. It consists of a lead shield with a pinhole aperture, a scintillating crystal within the shield viewed by a bank of seven photomultiplier tubes, a signal matrix circuit, a pulse‐height selector, and a cathode‐ray oscilloscope. Scintillations that fall in a certain range of brightness, such as the photopeak scintillations from a gamma‐ray‐emitting isotope, are reproduced as point flashes of light on the cathode‐ray tube screen in approximately the same relative positions as the original scintillations in the crystal. A time exposure of the screen is taken with an oscilloscope camera, during which time a gamma‐ray image of the subject is formed from the flashes that occur. One of many medical and industrial uses is described, namely the visualization of the thyroid gland with I¹³¹.