Anomalous effects on radiation detectors and capacitance measurements inside a modified Faraday cage

作者：Milian Sanchez V^*; Mocholi Salcedo A; Milian C; Kolombet V A; Verdu G

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 828: 210-228.

DOI：10.1016/j.nima.2016.05.051

• Capacitance variability
• Decay rates variability
• Modified Faraday cage
• Multichannel analyzer
• Multilayer ceramic capacitor
• Nuclides

We present experimental results showing certain anomalies in the measurements performed inside a modified Faraday cage of decay rates of Ra-226, TI-204 and Sr-90/1-90, of the gamma spectrum of a Cs-137 preparation, and of the capacitance of both a class-I multilayer ceramic capacitor and of the interconnection cable between the radiation detector and the scaler. Decay rates fluctuate significantly up to 5% around the initial value and differently depending on the type of nuclide, and the spectrum photo peak increases in 4.4%. In the case of the capacitor, direct capacitance measurements at 100 Hz, 10 kHz and 100 kHz show variations up to 0.7%, the most significant taking place at 100 Hz. In the case of the interconnection cable, the capacitance varies up to 1%. Dispersion also tends to increase inside the enclosure. However, the measured capacitance variations do not explain the variations observed in decay rates.

• 出版日期2016-8-21