A Noval X-ray powder Diffractometer Detector System

A new proportional counter x-ray detector with application for powder diffractometry has been developed. The new detector collects virtually the entire diffraction spectrum simultaneously with good efficiency and angular resolution. Thus, the powder spectrum of a small sample can be obtained much faster than with film or a conventional powder diffractometer. The detector read-out is digital and is interfaced to a dedicated minicomputer. A description of the detector system is discussed and preliminary results are presented.

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Study on X-Ray Stress Analysis Using a New Position-Sensitive Proportional Counter

Advances in X-ray Analysis ◽

10.1154/s0376030800016591 ◽

1978 ◽

Vol 22 ◽

pp. 233-240 ◽

Cited By ~ 7

Author(s):

Yasuo Yoshioka ◽

Ken-ichi Hasegawa ◽

Koh-ichi Mochiki

Keyword(s):

Residual Stresses ◽

Proportional Counter ◽

Counting Rate ◽

Angular Resolution ◽

Stress Measurement ◽

Over The Counter ◽

X Ray ◽

Position Sensitive ◽

The Mean ◽

Time Required

A position-sensitive proportional counter suitable for the X-ray stress measurement has been developed and residual stresses were measured with an apparatus that uses this PSD system. The counter was designed to have a good angular resolution over the counter length for the diffracted X-ray beam and high counting rates. The mean angular resolution measured was about 0.2° in 2θ (FWHM) at 200 mm, and the maximum allowable counting rate reached about 40,000 cps.The time required for the data accumulation was shown to be 1/10 to 1/30 of the time required with a standard diffractometer.

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A scanning X-ray spectroheliograph

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1970.0105 ◽

1970 ◽

Vol 317 (1528) ◽

pp. 101-112 ◽

Cited By ~ 2

Keyword(s):

Proportional Counter ◽

Grazing Incidence ◽

The Sun ◽

Design And Development ◽

X Ray ◽

Preliminary Results

A grazing incidence reflector which focuses radiation on to a proportional counter has been used to obtain X -ray pictures of the Sun in a number of relatively narrow wavelength bands below 2 nm. The design and development of the instrument is discussed together with the preliminary results from two rocket flights.

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X-Ray Stress Analysis of Austenite Stainless Steel by a New Position-Sensitive Proportional Counter with Uniform Angular Resolution

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.28.1015 ◽

1979 ◽

Vol 28 (313) ◽

pp. 1015-1021

Author(s):

Yasuo YOSHIOKA ◽

Ken-ichi HASEGAWA ◽

Koh-ichi MOCHIKI

Keyword(s):

Stainless Steel ◽

Stress Analysis ◽

Proportional Counter ◽

Angular Resolution ◽

X Ray ◽

Austenite Stainless Steel ◽

Position Sensitive

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Deconvolving the Nucleus of Centaurus A Using Chandra PSF Library

Symposium - International Astronomical Union ◽

10.1017/s0074180900220445 ◽

2001 ◽

Vol 205 ◽

pp. 66-69

Author(s):

Margarita Karovska ◽

T. Aldcroft ◽

M.S. Elvis ◽

I.N. Evans ◽

G. Fabbiano ◽

...

Keyword(s):

Black Hole ◽

Angular Resolution ◽

High Angular Resolution ◽

Central Source ◽

X Ray ◽

Preliminary Results ◽

Multi Scale ◽

Supermassive Black Hole ◽

Scale Structures ◽

Centaurus A

We describe preliminary results from our study of multi-scale structures in Centaurus A (NGC 5128) obtained using the Chandra X-ray Observatory HRC-I observations. The high-angular resolution Chandra images reveal X-ray multi-scale structures in this object with unprecedented detail and clarity. The region surrounding the Cen A nucleus, believed to be associated with a supermassive black hole, shows structures on arcsecond scales clearly resolved from the central source.

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Preliminary Results on Intermittent Behaviour of Millisecond Pulsar SAX J1808.4-3658

International Astronomical Union Colloquium ◽

10.1017/s0252921100152662 ◽

2004 ◽

Vol 194 ◽

pp. 220-220

Author(s):

M. T. Menna ◽

A. Papitto ◽

L. Burderi ◽

T. Di Salvo ◽

L. Stella ◽

...

Keyword(s):

Proportional Counter ◽

Millisecond Pulsar ◽

X Ray ◽

Binary Pulsar ◽

Orbital Parameters ◽

Preliminary Results ◽

Proportional Counter Array ◽

Year 2000

We analyzed RXTE data from the burst of the year 2000 of the X-ray millisecond binary pulsar SAX J 1808.4-3658 with the intent of determining the new orbital parameters.We used the observations of SAX J1808.4-3658 performed by the Rossi X-Ray Timing Explorer (RXTE) when the source was again detected in outburst during the period January-March 2000 (Wijnands et al. 2001). In particular we examined the data from the Proportional Counter Array (РСA) (Jahoda et al. 1996). We first applied barycentric correction to the data using the optical coordinates of the source (Roche et al. 98).

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2θ/α Scan X-Ray Powder Diffractometer

Advances in X-ray Analysis ◽

10.1154/s0376030800009058 ◽

1991 ◽

Vol 35 (A) ◽

pp. 383-391

Author(s):

Yuji Kobayashi

Keyword(s):

Optical System ◽

Present Method ◽

Angular Resolution ◽

Experimental Results ◽

X Rays ◽

X Ray ◽

Powder Diffractometer ◽

Sample Distance

AbstractThe Bragg-Brentano focussing method (2θ/θ scan) is widely used in X-ray powder diffractometers. We have recently manufactured a diffractometer (2θ/α scan) whose incidence and reflection sides are asymmetrical. This report describes the optical system, including evaluation and application. The present method enables the following benefits to be obtained by simply changing the sample-to-receiving slit distance b without changing the X-ray source-to-sample distance a: (1) enhanced angular resolution, (2) increased diffracted X-ray intensity, and (3) variable asymmetrical angle. The experimental results show that the focussing condition of this optical system was satisfied. It also shows that the intensity of diffracted X-rays could be increased by approximately 1.4 times at b = 100 mm when the intensity at a = 185 mm and b = 185 mm was assumed to be 1. Furthermore, it was verified that FWHM can be reduced by making sample to receiving slit distance greater.

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