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The Fabrication of Mercuric Iodide Detectors for Use in Wavelength Dispersive X-Ray Analysers and Backscatter Photon Measurements

Published online by Cambridge University Press:  15 February 2011

John H. Howes  and
John Watling
John H. Howes
Affiliation:
Aere Harwell, Didcot, Oxon. OXll ORA, UK.
John Watling
Affiliation:
Aere Harwell, Didcot, Oxon. OXll ORA, UK.
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Abstract

This paper describes the fabrication of mercuric iodide nuclear radiation detectors suitable for X and gamma ray spectrometry at room temperature. The active area of the detectors studied are between 0.2 and 1.5cm sq and they are up to 0.5mm thick. The method of producing a stable electrical contact to the crystal using sputtered germanium has been studied. The X-ray resolution of a 1.5cm sq. area detector at 32 keV is 2.3 keV FWHM when operated at room temperature in conjunction with a time variant filter amplifier. A factor which is important in the fabrication of the detector is the surface passivation necessary to achieve a useful detector life.

This type of detector has been used on a wavelength dispersive X-ray spectrometer for energy measurements between 10 and 100 keV. The advantages over the scintillation counter, more commonly used, is the improved resolution of the HgI2 detector and its smaller size. The analyser is primarily used for the detection of low levels of heavy metals on particulate filters. The detectors have also been used on an experimental basis for gamma ray backscatter measurements in the medical field.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 16: Symposium – F Nuclear Radiation Detector Materials , 1982 , 207
Copyright
Copyright © Materials Research Society 1983

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References

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