Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1994-05-10
1996-03-12
Hannaher, Constantine
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
2504721, 2504731, G01T 100
Patent
active
054988764
ABSTRACT:
A dosimetry method, dosimeter and system characterized by the steps of storing information in a three dimensional optical memory element, then exposing the optical memory element to neutron or other high LET radiation to alter the information stored in the optical memory element as a function of the radiation to which the optical memory element is exposed, and then retrieving the altered information from the optical memory element for subsequent analysis. The altered information is used to provide a measure of both the radiation dose and energy. In a preferred embodiment, the optical memory device is a 3-D ORAM comprising a volume of a transparent polymer doped with a light sensitive chemical and, in particular, spirobenzopyran. Also disclosed are a spectrometer for monitoring neutron and other types of radiation, an electronic dosimeter for providing real time monitoring of radiation exposure, and associated methodologies, all based on use of an optical memory element.
REFERENCES:
patent: 4288861 (1981-09-01), Swainson et al.
patent: 4983843 (1991-01-01), Thomson
Parthenopoulos et al., "Three-Dimensional Optical Storage Memory, Department of Chemistry", Science, vol. 245 (1989).
Stein, "Terabyte Memories with the Speed of Light", BYTE (1992).
Bolch et al., "A Method Of Obtaining Neutron Dose And Dose Equivalent From Digital Measurements And Analysis Of Recoil-Particle Tracks", Health Physics, vol. 53, No. 3, pp. 241-253, 1987.
Davis, "Use of Computer Memory Chips As The Basis For A Digital Albedo Neutron Dosimiter", Health Physics, vol. 49, No. 2 (1985).
Hunter et al., "Potentials of two-photon based 3-D optical memories for high performance computing", Applied Optics, vol. 29, No. 14, 10 May 1990.
Hankins et al., "Preliminary Study On The Use Of The Track Size Distribution On Electrochemically Etched R-39 Foils To Infer Neutron Spectra", Radiation Protection Dosimetry, vol. 20, No. 1/2, pp. 109-112, (1987).
Moscovitch, "Dosimeters For Measuring Neutron Dose Equivalent: New Approaches", Invited Paper. In The Proceedings Of The Eleventh DOE Workshop On Personnel Neutron Dosimetry, Las Vegas, NV, Jun. 4-7, 1991.
Griffith, "Review Of The State Of The Art In Personnel Neutron Monitoring With Solid State Detectors", Radiation Protection Dosimetry, vol. 23, No. 114, pp. 155-160 (1988).
Lund et al., "Neutron Dosimeter Using A Dynamic Random Access Memory As A Sensor", IEEE Transactions on Nuclear Science, vo. 33, No. 1, (1986).
R. M. MacFarlane, "Photon-Gated Spectral Holeburning" Journal of Luminescence 38 (1987).
Robert C. Bertelson, "Photochromic Process Involving Heterolytic Cleavage", in Techniques of Chemistry vol. III, Photochromism. (1971) pp. 45-55, 242-255.
McLaughlin, "VI: Films, Dyes, and Photographic Systems" in Manual on Radiation Dosimetry, pp. 129-177 (1970) pp. 129-177.
Malkin et al., "Photochemistry of Molecular Systems for Optical 3D Storage Memory", Research on Chemical Intermediates, vol. 19, No. 2, pp. 159-189 (1993).
Hinton, "How Neural Networks Learn from Experience", Scientific American (1992).
Coherent Brochure on DPSS 532, Coherent Inc. (1991).
Georgetown University
Hannaher Constantine
LandOfFree
Neutron spectrometer, real-time dosimeter and methodology using does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Neutron spectrometer, real-time dosimeter and methodology using , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutron spectrometer, real-time dosimeter and methodology using will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2102323