The measurements were performed on argon proportional counter
at pressure from 0.1 till 0.3 MPa using [sup.55]Fe calibration sources to record the shapes of the pulses from ionization with amplitudes from a few eV till a few keV.
. These use photo-ionization of gases within the counters to detect x-rays.
Key words: electron probe microanalysis; EPMA; gas flow proportional detector; GFPC; pulse pile-up rejection; sealed proportional counter
; x ray; XePC; x-ray detectors.
Features include mechanical or optical x-ray beam collimation, gas proportional counter
or semiconductor x-ray detector, and dual-encoded stage driver options.
A fragment of a large crystal grown for neutron diffraction studies and the availability of one of the first commercially produced x-ray area-detector system, a Xentronics (#) multiwire image proportional counter
, led to one of the highest-resolution datasets for an enzyme, 1.26 A resolution (21-23), at this time.
A decade later Rosat turned its Position Sensitive Proportional Counter
(PSPC) toward the spiral galaxy and captured the contour map reproduced below.
Using observations of the Imaging Proportional Counter
on the Einstein Observatory satellite, they found first that the intensity of X-ray halos represents an amount of dust consistent with what astrophysicists had calculated from the observed absorption of visible light.
Designed to measure Na-U in almost any matrix, from low PPM up, the analyzer incorporates either a proportional counter
or PIN-diode detector, and is available with tube and detector filters, for the ultimate in sensitivity, selectivity, and precision.