GB940940A - Improvements in or relating to gauging material properties - Google Patents
Improvements in or relating to gauging material propertiesInfo
- Publication number
- GB940940A GB940940A GB2346661A GB2346661A GB940940A GB 940940 A GB940940 A GB 940940A GB 2346661 A GB2346661 A GB 2346661A GB 2346661 A GB2346661 A GB 2346661A GB 940940 A GB940940 A GB 940940A
- Authority
- GB
- United Kingdom
- Prior art keywords
- container
- source
- detector
- calibration mode
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Radiation (AREA)
Abstract
940,940. Nuclear radiation backscatter gauges. INDUSTRIAL NUCLEONICS CORPORATION. June 28,1961, No. 23466/61. Heading G1A. A backscatter gauge for determiningthe weight per unit area or thickness of a moving sheet of material 14, Figs. 1 and 2, e.g. paper, by measuring the intensity of radiation, e.g. electrons from a radio-active source 12 reflected by the material back to a detector 10, e.g. an ionisation chamber, mounted with the source 12 at a predetermined distance D from the material is calibrated by withdrawing the source/detector assembly 10,12 from the material and inserting a standard reflector plate 30 between the assembly 10,12 and the material 14 so that in the calibration mode, Fig. 2, the assembly 10,12 is spaced from the reflector 30 by the predetermined distance D. The output from the detector 10 is coupled through a measuring circuit 26 to an indicating, recording and/or controlling instrument 28 and during the calibration mode the circuit 26 may be automatically standardised as described with respect to Figs. 2 and 6 of U.S.A. Specification 2, 951, 161 to compensate for contamination or decay of the radiation source and changes in the measuring circuit. As described the source and detector are moun- In a vertical cylindrical container 10, Fig. 6b, supported by vertical slides, Fig. 4 (not shown), in a screened housing having a horizontal base plate 40 parallel to the sheet under test, a circular aperture 242 in the base plate 40 being concentric with the container 10. The container 10 is movable vertically in its slides by means of a crank mechanism, Figs. 4 and 9 (not shown), actuated by a cam on a horizontal drive shaft which also actuates a rack and pinion to move the reflector plate 30 horizontally along slides on the upper surface of the base plate 40. The horizontal drive shaft is rotated by a pinion engaging a vertical rack, Fig. 9 (not shown), actuated by a fluid operated piston and cylinder and the cam producing the vertical movement of the source/detector container 10 is so shaped to provide a very rapid initial upward movement of the container 10 to allow the reflector plate 30 to move over the aperture 242, Fig. 6b, at the commencement of the calibration mode. The upper position of the container 10 during the calibration mode is determined by mechanical stops which are adjustable to ensure the correct spacing D between the container 10 and the reflector plate 30. The lower end of the container 10 is provided with a flanged metal ring 240, Fig. 6b, such that the flange 240 seats in the aperture 242 when the container 10 is lowered to the measuring position thereby preventing the entry of dirt into the mechanism and the source/detector may be protected by a thin window of organic sheet metal, e.g. "Mylar" (Trade name). When the aperture 242 is closed by the reflecting plate 30 in the calibration mode, the plate 30 acts as a shutter which prevents the escape of radiation from the housing and also prevents entry of dirt into the housing, the small gap between the base plate 40 and shutter 30 being sealed by felt strips 250, 252, Fig. 6b, over which the shutter 30 rides. U. S. A. Specification 2, 858, 450 also is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2346661A GB940940A (en) | 1961-06-28 | 1961-06-28 | Improvements in or relating to gauging material properties |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2346661A GB940940A (en) | 1961-06-28 | 1961-06-28 | Improvements in or relating to gauging material properties |
Publications (1)
Publication Number | Publication Date |
---|---|
GB940940A true GB940940A (en) | 1963-11-06 |
Family
ID=10196072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2346661A Expired GB940940A (en) | 1961-06-28 | 1961-06-28 | Improvements in or relating to gauging material properties |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB940940A (en) |
-
1961
- 1961-06-28 GB GB2346661A patent/GB940940A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2635192A (en) | Fluorescent spectral analysis | |
US2858450A (en) | Shutter system | |
US3353023A (en) | Safety shielding structure for portable nuclear gauge | |
US2501174A (en) | Radioactive measuring | |
US3505520A (en) | Measuring the incombustible content of mine dust using backscatter of low energy gamma rays | |
US4358854A (en) | Measuring devices for X-ray fluorescence analysis | |
US4575634A (en) | Assaying composite structures | |
GB940940A (en) | Improvements in or relating to gauging material properties | |
US3064130A (en) | Gamma instrument calibration | |
US3539808A (en) | Measuring corrosion on a coated metallic surface by means of backscattered nuclear radiation | |
US4467198A (en) | Radiation shielding arrangement for coating thickness measurement device | |
US3702734A (en) | Calibration means for instrument for reading dust accumulations on dark slides | |
US3668399A (en) | Gauge using environment-insensitive radiation beam cross-section limiter | |
US2945129A (en) | Calibrator for radioactivity well logging instruments | |
US3270203A (en) | Industrial-process-type measurements employing gamma-ray backscattering | |
CN110988972B (en) | High-precision three-dimensional portable surface pollution instrument calibrating device | |
US2425512A (en) | Measurement of thickness | |
US3911271A (en) | Radioisotope gauge for determining cement content of concrete | |
US2928947A (en) | Testing apparatus | |
US3160753A (en) | Method and means for measuring hardness | |
US3111581A (en) | Water level gauge comprising radioactive source and detector | |
US3742218A (en) | Air column density variation insensitive nucleonic gauging system | |
GB847264A (en) | Improvements relating to x-ray apparatus | |
JPS57172206A (en) | Correcting method for drift of plating thickness gauge | |
US3774034A (en) | Portable nuclear density-moisture instrument |