The next generation of current measurement for ionization chambers.

The next generation of current measurement for ionization chambers. Appl Radiat Isot. 2020 Sep;163:109216 Authors: Fitzgerald R, Bergeron DE, Giblin SP, Jarrett DG, Judge SM, Michotte C, Scherer H, Zimmerman NM Abstract Re-entrant ionization chambers (ICs) are essential to radionuclide metrology and nuclear medicine for maintaining standards and measuring half-lives. The requirements of top-level metrology demand that systems must be precise and stable to 0.1 % over many years, and linear from 10-14 A to 10-8 A. Thus, laboratories depend on bespoke current measurement systems and often rely on sealed sources to generate reference currents. To maintain and improve present capabilities, metrologists need to overcome two looming challenges: ageing electronics and decreasing availability of sealed sources. Possible solutions using Ultrastable Low-Noise Current Amplifiers (ULCAs), resistive-feedback electrometers, and (quantum) single-electron pumps are reviewed. Broader discussions of IC design and methodology are discussed. ULCAs show promise and resistive-feedback systems which take advantage of standard resistor calibrations offer an alternative. PMID: 32561054 [PubMed - as supplied by publisher]
Source: Applied Radiation and Isotopes - Category: Radiology Authors: Tags: Appl Radiat Isot Source Type: research