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A rod source/point detector arrangement offers numerous advantages that cannot be achieved with a point source/rod detector arrangement. Due to less frequent production downtimes, simpler and thus more economical spare parts inventory, increased long-term and temperature stability and consistent process quality, the higher acquisition costs are mitigated within a short period of time.

Introduction

When planning a radiometric measurement, the technical design is fundamental. It is created and developed based on process conditions, process geometry, customer input as well as local background radiation, site conditions, and mounting space limitations.
For the design of radiometric level or bulk flow measurements, a choice must be made between two arrangements: a point source with a rod detector, or a rod source and a point detector, see fig 1.
Due to the slightly lower purchase price, the arrangement with a point source and rod detector is frequently selected. However, the rod source (especially using Cobalt-60 (Co-60)) and point detector arrangement offers decisive advantages in measurement quality during operation, which will be addressed in this whitepaper.

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