Romano A, Pacella D, Mazon D, Murtas F, Malard P, Gabellieri L, Tilia B, Piergotti V, Corradi G
Associazione Euratom-ENEA, CR Frascati, Via E. Fermi 45, Frascati, Roma 00044, Italy.
Rev Sci Instrum. 2010 Oct;81(10):10E523. doi: 10.1063/1.3494382.
A gas detector with a 2D pixel readout is proposed for a future soft x-ray (SXR) tomography with discrimination in energy bands separately per pixel. The detector has three gas electron multiplier foils for the electron amplification and it offers the advantage, compared with the single stage, to be less sensitive to neutrons and gammas. The energy resolution and the detection efficiency of the detector have been accurately studied in the laboratory with continuous SXR spectra produced by an electronic tube and line emissions produced by fluorescence (K, Fe, and Mo) in the range of 3-17 keV. The front-end electronics, working in photon counting mode with a selectable threshold for pulse discrimination, is optimized for high rates. The distribution of the pulse amplitude has been indirectly derived by means of scans of the threshold. Scans in detector gain have also been performed to assess the capability of selecting different energy ranges.
提出了一种具有二维像素读出功能的气体探测器，用于未来的软X射线（SXR）断层扫描，每个像素可分别在能带中进行鉴别。该探测器有三个气体电子倍增箔用于电子放大，与单级相比，它具有对中子和伽马射线不太敏感的优点。利用电子管产生的连续SXR光谱以及荧光（K、Fe和Mo）产生的线发射，在3-17 keV范围内，在实验室中对探测器的能量分辨率和探测效率进行了精确研究。前端电子设备工作在光子计数模式，具有可选择的脉冲鉴别阈值，针对高速率进行了优化。通过阈值扫描间接得出了脉冲幅度的分布。还进行了探测器增益扫描，以评估选择不同能量范围的能力。
