X-ray or gamma ray systems or devices – Accessory – Object holder or support
Patent
1995-10-13
1997-12-30
Wong, Don
X-ray or gamma ray systems or devices
Accessory
Object holder or support
378 79, H05G 100
Patent
active
057039275
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates generally to the field of disposable sample holders for X-ray spectroscopic analysis and more particularly to a handling support for safe and efficient handling of the sample holders.
This invention also relates to a safety ring mounting a microporous film across one face of a double open-ended sample holder cell for X-ray spectroscopic analysis for the purpose of providing safe and efficient use of the sample holder.
BACKGROUND OF THE INVENTION
The field of X-ray spectroscopy involves the measurement of the spectra of certain material being analyzed. Generally, the sample material being analyzed may be any liquid, slurry, powder material, or industrial gas that can occur in the run of industry. A sample is positioned in a cylindrical sample holder that includes a holder body forming a cell adapted to contain the sample. A disposable sample holder is generally made of plastic and is generally disposed of after a single use. A sample holder generally ranges in size between diameters of 20 to 57 mm and in height about 25 to 35 mm.
Sample holders include single open-ended cylindrical body type cells and double open-ended cylindrical body cells. For the double open-ended cell, a very thin plastic analytic film is placed as an X-ray transparent window across one of the circular end faces of the body of the holder, and the skirt of the film is then secured by a plastic securing ring to the outer wall of the body and the analytic film becomes taut. The body is then inverted so that the window face is positioned downwards. Alternatively, the plastic securing ring and the thin plastic analytic film is placed into a well of a sample holder film assembly device and one of the circular end faces of the holder body is placed over the film and the skirt of the film is then secured by the plastic ring to the outer wall of the body so that the analytic film becomes taut. The latter method is described in our U.S. Pat. No. 4,587,656. It is noted that the plastic securing rings are made of a thin, plastic, flexible material so that the thin analytic film can be gently yet firmly secured to the sample holder body. A double open-ended sample holder is illustrated in FIGS. 1 and 2 and discussed in relation therewith below.
In each of the above-described assembly methods, one circular end face is open so as to form a holder cell. The holder cell is then filled with the sample through the top open face of the cell. The sample may be a benign substance or it may be noxious, contaminated, caustic, or offensive. In addition, the sample may be treated with a solvent to dissolve the sample, the solvent itself being noxious.
After the sample material to be analyzed has been loaded into the sample cell and otherwise prepared for X-ray analysis, the cell is loaded into an X-ray sample cassette that is then moved into position for bombardment by X-rays. X-ray cassettes are cylindrical holders defining chambers into which the sample holder cell is loaded. Generally, the chambers of the cassettes have top edges that are of greater height than the height of the top edges of the sample holder cells. In addition, the diameters of the cassettes are generally only slightly greater than the diameters of the sample holders so that little space is provided between the wall of the cassette and the wall of the sample holder. Cassettes often have a spring-loaded screw-on cap over the cell.
In the present state of the art, a double open-ended sample holder is loaded into an X-ray cassette by hand by a technician. More in detail, the double open-ended cell is picked up by the technician, who may or may not be wearing protective gloves, transferred to a position above the cassette, and hand placed into the cassette. Also, the cassette may be located for loading purposes in an isolation chamber in which the double open-ended sample holder is placed into the cassette by a technician who manipulates the holder with flexible gloves that extend into the chamber.
In the process of X-ray analysis, when X-rays a
REFERENCES:
patent: 5253280 (1993-10-01), Mizuta
patent: 5351281 (1994-09-01), Torrisi et al.
Torrisi Angelo M.
Urbano Roland
Sutton Paul J.
Torrisi Angelo M.
Wong Don
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