Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208, USA.
J Magn Reson. 2010 Jul;205(1):109-13. doi: 10.1016/j.jmr.2010.04.006. Epub 2010 Apr 24.
A 2 mm diameter by 10mm long cylinder of fused SiO2 (quartz) gamma-irradiated to 1 kGy with 60Co contains about 2x10(16) spins/cm3. It is proposed as a standard for monitoring signal-to-noise (S/N) performance of X-band pulsed EPR spectrometers. This sample yields S/N of about 25 on modern spin echo spectrometers, which permits measurement of both signal and noise under the same conditions with an 8-bit digitizer.
一个直径 2 毫米、长 10 毫米的熔融二氧化硅(石英)圆柱体,用 60Co 辐照至 1 kGy,其中含有约 2x10(16)个自旋/cm3。它被提议作为监测 X 波段脉冲电子顺磁共振波谱仪信号噪声比(S/N)性能的标准。该样品在现代自旋回波波谱仪上产生约 25 的 S/N,这使得在相同条件下使用 8 位数字转换器同时测量信号和噪声成为可能。