WO1997011389A1 - Detecteur de rayons gamma - Google Patents

Detecteur de rayons gamma Download PDF

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Publication number
WO1997011389A1
WO1997011389A1 PCT/US1996/015129 US9615129W WO9711389A1 WO 1997011389 A1 WO1997011389 A1 WO 1997011389A1 US 9615129 W US9615129 W US 9615129W WO 9711389 A1 WO9711389 A1 WO 9711389A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrically conductive
gamma detector
cavity
detector
signal collection
Prior art date
Application number
PCT/US1996/015129
Other languages
English (en)
Inventor
Steven G. Walters
Ducan W. Macarthur
Original Assignee
Koster, James, E.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koster, James, E. filed Critical Koster, James, E.
Priority to AU73669/96A priority Critical patent/AU7366996A/en
Publication of WO1997011389A1 publication Critical patent/WO1997011389A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/185—Measuring radiation intensity with ionisation chamber arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles
    • H01J47/02—Ionisation chambers

Definitions

  • the present invention provides a gamma detector based on technology which is contained in several U.S. Patents which disclose various devices for the long range detection of alpha particles.
  • the first is U.S. Patent No. 5,184,019, issued February 2, 1993, for a Long Range Alpha Particle Detector.
  • the second is U.S. Patent No. 5,194,737, issued March 16, 1993, for Single and Double Grid Long Range Alpha Detectors.
  • the third is U.S. Patent No. 5,187,370, issued February 16, 1993, for Alternating Current Long Range Alpha Particle Detectors.
  • the fourth is U.S. Patent No. 5,281,824, issued January 25, 1994, for Radioactive Detection.
  • the fifth is U.S. Patent No.
  • the present invention provides apparatus which is capable of detecting gamma radiation while at the same time being equally capable both in the laboratory and in the field. It employs technology which originated with the detection of alpha particles, but improves on this technology to provide accurate and sensitive detection of gamma radiation.
  • electrically conductive enclosure JJ. whatever electrically conductive material is used to construct electrically conductive enclosure JJ., the gas contained in electrically conductive enclosure JJ. may be, does not have to be pressurized. Ambient pressure is totally satisfactory for proper operation of detector J_0.
  • voltage source 18 and electrometer J9 are placed inside electrically conductive enclosure H. In other embodiments, it may be more desirable for voltage source J_8 and electrometer J9 to be located outside of electrically conductive enclosure 1 1.
  • detector JjO connected to voltage source J_8 and electrometer 19, is placed into a position subject to penetration by gamma rays 20.
  • gamma rays 20 encountering detector 1_0 will interact with either electrically conductive enclosure JJ . , in which metallic electrons 2J_ will be liberated and create gas ions in cavity 1 la, or will pass through electrically conductive enclosure JJ . and directly interact with gas molecules in cavity 1 la, creating gas ions.
  • the greatest effect ofthe metallic ions liberated from electrically conductive enclosures JJ . will occur near the inner surface of electrically conductive enclosures JJ.. Therefore, in smaller volume electrically conductive enclosures JJ., these metallic ions will contribute to the signal collected by signal collector 12. In larger electrically conductive enclosures JJ . , the metallic ions will have less effect.
  • the data from each detector were normalized to an ionization chamber positioned next to the critical assembly ("FLATTOP") which is used to measure the critical assembly's power level.
  • FLATTOP critical assembly
  • the direct line of sight results for the Nal detector and for detector 10 are tabulated in Table I, while the skyshine results are tabulated in Table II.
  • the output of detector 10 is in femtoamperes (fA) so the output listed in Tables 1 and II represent the normalized fA reading.
  • the output ofthe Nal detector is in cps, and the output listed in Tables 1 and II represent the normalized cps reading.
  • detector K is extremely useful in detecting gamma radiation, even at distances greater than 5000 ft.
  • the output obtained from detector JO is comparable to the Nal detector for both the line of sight and skyshine locations. This is very important, since detector JJ) needs neither a photo tube nor a sensitive and expensive crystal is necessary for its operation. It should also be realized that detector JO is extremely rugged and durable, and can be left in operation, unattended, for years at a time.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measurement Of Radiation (AREA)

Abstract

L'invention porte sur un détecteur de rayons gamma comportant un boîtier électroconducteur (11), définissant une cavité remplie de gaz et doté d'un moyen (12) de réception de signaux monté de manière isolante dans la cavité et positionné pour la recouvrir de manière à ce que les ions gaz produits par interaction avec les rayons gamma soit capturés électrostatiquement par le moyen (12) de réception de signaux lorsqu'un potentiel électrique est appliqué entre le boîtier électroconducteur (11) et le moyen (12) de réception de signaux. Des indicateurs (19) fixés au moyen (12) de réception de signaux indiquent le courant électrique produit par réception des ions gazeux produits dans la cavité par les rayons gamma. Une source de tension (18) branchée entre les indicateurs (19) et le boîtier électroconducteur (11) fournit la tension nécessaire à la réception des ions gazeux.
PCT/US1996/015129 1995-09-21 1996-09-20 Detecteur de rayons gamma WO1997011389A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73669/96A AU7366996A (en) 1995-09-21 1996-09-20 Gamma ray detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53199895A 1995-09-21 1995-09-21
US08/531,998 1995-09-21

Publications (1)

Publication Number Publication Date
WO1997011389A1 true WO1997011389A1 (fr) 1997-03-27

Family

ID=24119981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/015129 WO1997011389A1 (fr) 1995-09-21 1996-09-20 Detecteur de rayons gamma

Country Status (2)

Country Link
AU (1) AU7366996A (fr)
WO (1) WO1997011389A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7064337B2 (en) 2002-11-19 2006-06-20 The Regents Of The University Of California Radiation detection system for portable gamma-ray spectroscopy

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207938A (en) * 1953-07-24 1965-09-21 Anton Nicholas Superatmospheric pressure ionization chamber for detection of radiant energy
US4300050A (en) * 1979-03-12 1981-11-10 Osterreichisches Forschungszentrum Seibersdorf Gmbh Secondary-standard ionization chamber, in particular for measuring the energy dose
JPH03190048A (ja) * 1989-12-19 1991-08-20 Aloka Co Ltd 電離箱式検出器
US5194737A (en) * 1991-10-08 1993-03-16 University Of California Patent, Trademark & Copyright Office Single and double grid long-range alpha detectors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207938A (en) * 1953-07-24 1965-09-21 Anton Nicholas Superatmospheric pressure ionization chamber for detection of radiant energy
US4300050A (en) * 1979-03-12 1981-11-10 Osterreichisches Forschungszentrum Seibersdorf Gmbh Secondary-standard ionization chamber, in particular for measuring the energy dose
JPH03190048A (ja) * 1989-12-19 1991-08-20 Aloka Co Ltd 電離箱式検出器
US5194737A (en) * 1991-10-08 1993-03-16 University Of California Patent, Trademark & Copyright Office Single and double grid long-range alpha detectors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7064337B2 (en) 2002-11-19 2006-06-20 The Regents Of The University Of California Radiation detection system for portable gamma-ray spectroscopy

Also Published As

Publication number Publication date
AU7366996A (en) 1997-04-09

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