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Updated: May 2, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
[Conservative calibration of a clearance monitor system for waste material from nuclear medicine]
Carsten Wanke1, Lilli Geworski1
1Medizinische Hochschule Hannover, Stabsstelle Strahlenschutz und Abteilung Medizinische Physik - OE 0020, Carl-Neuberg-Str. 1, D-30625 Hannover.
Abstract:
Clearance monitor systems are used for gross gamma measurements of waste potentially contaminated with radioactivity. These measurements are to make sure that legal requirements, e.g. clearance criteria according to the german radiation protection ordinance, are met. This means that measurement results may overestimate, but must not underestimate the true values. This paper describes a pragmatic way using a calibrated Cs-137 point source to generate a conservative calibration for the clearance monitor system used in the Medizinische Hochschule Hannover (MHH). The most important nuclides used in nuclear medicine are considered. The measurement result reliably overestimates the true value of the activity present in the waste. The calibration is compliant with the demands for conservativity and traceability to national standards.
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