Portable triple silicon detector telescope spectrometer for skin dosimetry

Details Portable triple silicon detector telescope spectrometer for skin dosimetry Portable triple silicon detector telescope spectrometer for skin dosimetry

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.438..523h&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 438, Issue 2-3, p. 523-539.

Physics

Scientific paper

The features of a newly developed portable beta telescope spectrometer are described. The detector probe uses three silicon detectors with the thickness: 50μm/150μm/7000μm covered by a 2μm thick titanium window. Rejection of photon contributions from mixed beta/photon exposures is achieved by coincidence requirements between the detector signals. The silicon detectors, together with cooling aggregate, bias supplies, preamplifiers and charge generation for calibration are contained in a handy detector probe. Through a 3- or 10-m cable the detector unit is connected to a compact, portable processing unit including a laptop computer executing control, monitor, histogram and display tasks. The use of digital signal processing at an early stage of the signal chain has facilitated the achievement of a compact, low-weight device. 256 channels are available for each of the three detectors. The LabVIEWTM software distributed by National Instruments was used for all program developments for the spectrometer, comprising also the capability of evaluating the absorbed dose rates from the measured beta spectra. The report describes the capability of the telescope spectrometer to measure beta and photon spectra as well as beta dose rates in mixed beta/photon radiation fields. It also describes the main features of the digital signal-processing electronics.

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