BASIC EXPOSURE TIME OPTIMIZATION OF A SOLID-STATE RADIATION DETECTOR IN SCINTILLATION ATOMIC EMISSION SPECTROMETRY

A. A. Dzyuba, V. A. Labusov, S. A. Babin

Аннотация


An experimental study of the signal-to-noise ratio in scintillation atomic-emission spectrometry was performed to optimize basic exposure time of the solid-state detectors using as an example a BLPP-2000 photodiode array produced by VMK-Optoelektronika. Obtained dependences of the signal-to-noise ratio on this exposure time confirm the corresponding formula that takes into account the following parameters: the shape and duration of scintillations of spectral lines; the number of photoelectrons generated by scintillations; dark current and background photocurrent; read noise, synchronization mode. Single-channel recording of simulated flashes of a light-emitting diode and simultaneous dual-channel recording of scintillations of the gold Au 267.595-nm line from the injection of powdered geological samples into an electric arc were used. An equation was derived to estimate the optimal exposure time. The calculated and experimental data for the BLPP 2000 array show that the optimal exposure time for recording the analyte microparticles of the size of interest is approximately equal to the length of their flashes.

 Keywords: time-resolved spectroscopy, atomic emission spectral analysis, powdered geological samples, scintillation, multi-element solid-state detectors, detection limit reduction, optimal exposure time.

 DOI:http://dx.doi.org/10.15826/analitika.2015.19.1.005

 


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Литература


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