A Scintillation Counter for the Relative Determination of X‐Ray Intensities in Radiological Work

An instrument is described for determining accurately the intensity of an x‐radiation by direct reading. This instrument consists in a small potassium iodide crystal which fluoresces under the action of high energy photons. The light thus emitted is ``piped'' by means of a Lucite rod to a photomultiplier tube. The current generated in the tube is measured by a microammeter.A series of tests on the energy dependence of this detector are reported. It is concluded that the instrument described is suitable for the determination of isodose charts.