what is the Detector Efficiency for Cs-137 and All Built-In Isotopes for the Ranger

Radiation Alert Ranger – Detector Efficiency Statement for Cs-137 and All Built-In Isotopes S.E. International, Inc. (SEI) is the original equipment manufacturer (OEM) of the Radiation Alert Ranger, a hand-held GM-based radiation detection instrument. This document provides the factory-programmed detector efficiency values for the Ranger, explains the measurement geometry under which those values were determined, […]