A New Method and Apparatus for High-Resolution γ-Radiographic Introscopy of Bulk Heavy-Metal Products and Blanks. First Application Results

Abstract

A \(\gamma \)-introscopy method and an installation using “electronic focusing” of \(\gamma \)-quanta transmitted through the studied object are proposed. The apparatus contains a powerful ⁶⁰Co-source; a device for positioning the studied object; and a measuring facility, including a thin scintillation coordinate detector-scatterer with 64 silicon photomultipliers (SiPMs) and digital detector pulse processors (PDPs), a total absorption scintillation detector with analog-digital PDP, a unit for coincidence and energy event selection and on-line coordinate calculation, and a communication interface to a PC. The spatial resolution achieved for thick objects is \( \approx \)400 μm. The theoretical limit is \( \approx {\kern 1pt} 50\) μm.