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Gas chromatographs with electron capture detectors are widely used for the analysis of electron affine substances such as pesticides or chlorofluorocarbons. Being able to achieve limits of detection in the low pptv-range, electron capture detectors are the most sensitive detector available for such compounds. Based on their operating principle, they require free electrons at atmospheric pressure, which are usually generated using a β--decay. However, the use of radioactive materials leads todoi:10.5162/sensor2017/p3.3 fatcat:e7z5yoaddrdh5lb2f2sse4x5e4