Measurement of the characteristic x ray of oxygen and other ultrasoft x rays using mercuric iodide detectors

Iwanczyk, J. S.; Dabrowski, A. J.; Huth, G. C.; Economou, T. E.
March 1985
Applied Physics Letters;3/15/1985, Vol. 46 Issue 6, p606
Academic Journal
This letter reports the detection and resolution of the characteristic x ray of oxygen at 523 eV and other ultrasoft x rays (photons energy less than 1 keV) using radiation detectors fabricated from the compound semi-insulator mercuric iodide (HgI2). These detectors are capable of operation at room ambient but in these experiments were slightly cooled using a Peltier element to 0 °C. A pulsed light feedback preamplifier with a Peltier element cooled (to -30 °) first stage field-effect transistor was used to amplify signals from the detector. Overall system noise level was 185 eV (full width at half-maximum) limited by the temperature of the first stage field-effect transistor. With optimal cooling of this element the characteristic x ray of carbon at 282 eV should be measurable. These results would seem to be important in measurement of biological samples in electron column instruments.


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