Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1993-09-01
1995-08-08
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
2502521, 2503361, 250375, G01T 1167, G01T 1185
Patent
active
054401356
ABSTRACT:
An apparatus for detecting the area and concentration of radioactive contamination on surfaces, objects and personnel is capable of automatic adjustment without intervention by an operator, providing for self-calibration and avoiding the need for periodic calibration, source checking and maintenance by personnel. The apparatus is comprised of one or more position sensitive proportional counters coupled together to act as a single counter. A computer based acquisition system is used to collect the time, energy and position of an ionization event that is caused by the contamination. Collimated radiation sources are located inside of each position sensitive proportional counter. These sources act as stable artifacts in the position and energy spectra that the device acquires as a function of time. The computer continuously adjusts parameters such as detector high voltage, amplifier gain and discrimination to keep the count rate, energy and position that the system measures for these check sources constant. This also corrects for drift and other variations that would cause the system to become misaligned. The apparatus has been built into conveyor systems for monitoring laundry and into portal monitors that are used to monitor workers exiting an area that is contaminated with radioactivity. It has also been used with wheels as a floor monitor and as a stand alone counter for direct monitoring of contamination.
REFERENCES:
patent: 2842676 (1958-07-01), Schiring et al.
patent: 3174040 (1965-03-01), Eberline
patent: 3218460 (1965-11-01), Scherbatskoy
patent: 3317823 (1967-05-01), Brodsky
patent: 3603797 (1971-09-01), Borkowski et al.
patent: 3670164 (1972-06-01), Hardy et al.
patent: 3895232 (1975-07-01), Schneeberger
patent: 3911279 (1975-10-01), Gilland et al.
patent: 4019057 (1977-04-01), Bram
patent: 4320299 (1982-03-01), Bateman et al.
patent: 4352019 (1982-09-01), Pollard
patent: 4392057 (1983-07-01), Mathieson et al.
patent: 4400621 (1983-08-01), Kiefer et al.
patent: 4426580 (1984-01-01), Smith
patent: 4431921 (1984-02-01), Filthuth
patent: 4509042 (1985-04-01), Kruse
patent: 4598202 (1986-07-01), Koechner
patent: 4629897 (1986-12-01), Lemmonnier
patent: 4731535 (1988-03-01), Rische et al.
patent: 4866277 (1989-09-01), Johnson et al.
patent: 5017788 (1991-05-01), Humphrey et al.
patent: 5180917 (1993-01-01), Wraight
Owen et al., "One and Two Dimensional Position Sensing Semiconductor Detectors", pp. 290-303. (No Date or Place of Publication).
Lampton et al., "Delay-Line Anode for Microchannel-Plate Spectrometer", NASA Tech Briefs MFS-26073, Mar. 1979, pp. 1-19 and 21-23.
Buchanan et al., "Intelligent Automatic Gain Stabilization for Radiation Energy Spectra", 1 page. (No Date or Place of Publication).
Borkowski et al., "Some Applications and Properties of One- and Two-Dimensional Position-Sensitive Proportional Counters", pp. 340-349. (No Date or Place of Publication).
Borkowski et al., "Proportional Counter Photon Counter", pp. 161-168. (No Date or Place of Publication).
Sharpe, "Nuclear Radiation Detectors", New York: John Wiley & Sons, Inc., pp. 184-201 (No Date of Publication).
R. K. Crawford & J. R. Haumann--Nuclear Instruments And Methods In Physics Research A292--Nonlinearities In The Charge-Division Encoding of Position-Sensitive Detectors--(1990) pp. 657-670.
M. Lampton, O. Siegmund, & R. Raffanti--Rev. Sci. Instrum. 58--Delay Line Anodes For Microchannel-plate spectrometers--1987--pp. 2298-2305.
Bruno B. Rossi & Hans H. Staub--Ionization Chambers And Counters-Experimental Techniques--1949--pp. 1-101.
S. Kalbitzer & W. Melzer--Nuclear Instruments & Methods 56--On The Charge Dividing Mechanism In Position Sensitive Detectors--1967--pp. 301-304.
G. L. Miller, N. Williams, A. Senator, R. Stensgaard & J. Fischer--Nuclear Instruments And Methods 91--A Position Sensitive Detector For A Magnetic Spectrograph--1971--pp. 389-396.
E. Mathieson, K. D. Evans, W. Parks & P. F. Christie--Nuclear Instruments And Methods 121--Signal Location By Shorted RC Line--(1974)--pp. 139-149.
E. Mathieson, K. D. Evans, K. Cole & R. Everett--Nuclear Instruments And Methods 126--Signal Location By Open Circuit RC Line--1975--pp. 199-204.
E. Mathieson--Nuclear Instruments And Methods 97--Linearity And Noise Considerations For Position Sensitive Detectors--1971--pp. 171-176.
H. W. Fulbright, R. G. Markham & W. A. Lanford--Nuclear Instruments And Methods 108--Position Sensitive Particle Detectors Used In A Magnetic Spectrometer--1973 pp. 125-133.
C. J. Borkowski & M. K. Kopp--Rev. Sci. Instrum, vol. 46, No. 8--Design And Properties of Position-Sensitive Proportional Counters Using Resistance-Capacitance Position Encoding--1975--pp. 951-962.
J. Hough & R. W. P. Drever--Nuclear Instruments & Methods 103--Proportional Counters For The Localisation of Ionising Radiation--1972 pp. 365-372.
J. L. C. Ford, Jr., P. H. Stelson & R. L. Robinson--Nuclear Instruments And Methods 98--A Position Sensitive Proportional-Detector For A Magnetic Spectrograph 1972--pp. 199-203.
A Doehring, S. Kalbitzer & W. Molzer--Nuclear Instruments & Methods 59--On The Ballistic Deficit And The Signal-To-Noise Ratio of Semiconductor Spectrometers For Energy And Position Spectroscopy--1968--pp. 40-44.
M. E. Williams, T. Kruse, D. Bayer & N. Williams--Nuclear Instruments And Methods 102--Particle Indentification For A Position Sensitive Proportional Counter--1972--pp. 201-204.
N. Williams, T. H. Kruse, M. E. Williams & J. A. Fenton--Nuclear Instruments & Methods 93--A Proportional Counter Telescope For Position Determination And Particle Indentification In A Magnetic Spectrograph--1971--pp. 13-16.
C. J. Borkowski & M. K. Kopp--The Review of Scientific Instruments, vol. 39, No. 10--New Type of Position-Sensitive Detectors of Ionizing Radiation Using Risetime Measurement--Oct. 1968--pp. 1515-1522.
W. R. Kuhlmann, K. H. Lauterjung, B. Schimmer & K. Sistemich--Nuclear Instruments And Methods 40--Ortsempfindliche Zahlrohre--1966--pp. 118-120.
B. Greennberg--J. Sci. Instrum.--A Locus-Sensitive Proportional Counter--1967--pp. 203-208--vol. 44.
A. N. Anderson, R. J. Barrett, E. A. Wadlinger--Los Alamos Scientific Laboratory of The University of California--Low Deadtime Delay Line Readout for Position-Sensitive Proportional Counters--Mar., 1974--pp. 1-2.
D. M. Lee & S. E. Sobottka--Nuclear Instruments And Methods 104--A Bifilar Helical Multiwire Proportional Chamber For Position Sensitive Detection of Minimum Ionizing Particles--1972--pp. 179-188.
J. R. Gilland & J. G. Emming--Nuclear Instruments And Methods 104--A Multiwire Proportional Counter With Integral Readout Delay Line--1972--pp. 241-243.
C. J. Borkowski & M. K. Kopp--Presented at the 13th Scintillation and Semiconductor Counter Symposium--Proportional Counter Photon Camera--Jun. 1972--pp. 1-15.
M. K. Kopp--The Review of Scientific Instruments, vol. 42, No. 5--Wide Band Low Noise Voltage Sensitive Preamplifier With Temperature Compensation--May 1971--pp. 714-715.
A. Gabriel & Y. Dupont--The Review of Scientific Instruments--vol. 43 --No. 11--A Position Sensitive Proportional Detector for X-Ray Crystallography--Nov. 1972--pp. 1600-1602.
A. Rindi, V. Perez-Mendez & R. I. Wallace--Nuclear Instruments And Methods 77--Delay-line Readout For Proportional Chambers--1969--pp. 325-327.
J. L. Alberi & V. Radeka--IEEE Transactions on Nuclear Science--vol. NS-23, No. 1--Position Sensing By Charge Division--Feb. 1976--pp. 251-258.
K. Siegbahn-Uppsala--D. A. Bromley--Nuclear Instruments And Methods 162--Detectors In Nuclear Science--Part 1--vol. 162, Nos. 1-3--pp. 276-304 (1979).
J. Byrne & F. Shaiki & J. Kyles--Nuclear Instruments And Methods 79--Avalanche Chain Development In An Argon-Methane Proportional Counter--1970--pp. 286-292.
R. Bock, H. H. Duhm, W. Melzer, F. Puhl Hofer & B. Stadler--Nuclear Instruments And Methods 41--An Array of Position Sensitive Surface Barrier Detectors For Use In A Broad Range Magnetic Spectrograph 1966--pp. 190-194.
W. N. McDicken--Nuclear Instruments And Methods 54--A Position Sensitive Geiger Counter--1967--pp. 157-158.
Glick Edward J.
Hannaher Constantine
Kuester Jeffrey R.
Shonka Research Associates, Inc.
Witherspoon James A.
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