WO2014142961A1 - Procédé et système de détection d'un rayonnement de neutrons - Google Patents

Procédé et système de détection d'un rayonnement de neutrons Download PDF

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Publication number
WO2014142961A1
WO2014142961A1 PCT/US2013/032034 US2013032034W WO2014142961A1 WO 2014142961 A1 WO2014142961 A1 WO 2014142961A1 US 2013032034 W US2013032034 W US 2013032034W WO 2014142961 A1 WO2014142961 A1 WO 2014142961A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
sensitive component
anode
sensitive
cathode
Prior art date
Application number
PCT/US2013/032034
Other languages
English (en)
Inventor
Yansong Gu
Original Assignee
Empire Technology Development Llc
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 Empire Technology Development Llc filed Critical Empire Technology Development Llc
Priority to PCT/US2013/032034 priority Critical patent/WO2014142961A1/fr
Publication of WO2014142961A1 publication Critical patent/WO2014142961A1/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
    • G01T1/26—Measuring radiation intensity with resistance detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T3/00—Measuring neutron radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T5/00—Recording of movements or tracks of particles; Processing or analysis of such tracks

Definitions

  • Ionizing radiation involves the radiation of particles that individually carry sufficient energy to liberate an electron from an atom or molecule.
  • Neutron radiation is a type of ionizing radiation that involves the release of free neutrons from atoms. The released neutrons may react with nuclei of other atoms to form new isotopes.
  • the radiation-sensitive polymer includes a plurality of embedded conductive structures such as carbon nanotubes, graphenes, metal nanowires, or metal fibers.
  • FIG. 3 depicts a neutron radiation sensing device in accordance with another illustrative embodiment.
  • Fig. 1 depicts a neutron radiation sensing device 100 in accordance with an illustrative embodiment.
  • Neutron radiation sensing device 100 includes an anode 1 10 and a cathode 120.
  • Anode 1 10 and cathode 120 may include any electrically-conductive material known to those of skill in the art.
  • anode 1 10 and cathode 120 may include gold, copper, silver, or any other suitable electrically-conductive material known to those of skill in the art.
  • anode 1 10 and cathode 120 are located on a substrate 140.
  • Substrate 140 may include one or more of silicon dioxide, ceramic, glass, polymer, or any other suitable insulative or semi-insulative materials known to those of skill in the art. In alternative embodiments, substrate 140 may be omitted.
  • the concentration of electrically-conductive structures may vary, for example, from about 0.5 wt.% to 5 wt. %. Specific examples of concentration include about 0.5 wt.%, about 1 wt.%, about 2 wt.%, about 3 wt.%, about 4 wt.%, about 5 wt.%, and ranges between any two of these values (including endpoints).
  • the neutron particles passing into the radiation-sensitive component leave a trail of damage along their respective tracks in the form of broken molecule chains and free radicals.
  • the damage to the radiation-sensitive component reduces its electrical conductivity, thereby increasing its resistance.
  • Fig. 6 depicts a method of preparing a radiation detection apparatus in accordance with an illustrative embodiment.
  • an anode and a cathode are formed from electrically-conductive materials via any of several methods known to those of skill in the art.
  • the anode and cathode may include any electrically-conductive material known to those of skill in the art.
  • the anode and cathode may include gold, copper, silver, or any other suitable electrically-conductive material.
  • the anode and the cathode are formed on a substrate.
  • the substrate may include one or more of silicon dioxide, ceramic, glass, polymer, or any other suitable insulative materials known to those of skill in the art.
  • radiation-sensitive component 130 includes a Ci 2 H 18 0 7 polymer with a density of approximately 1 .3 g/cm 3 and is placed at a distance of about 4 cm from an interaction point.
  • a neutron radiation sensor is provided with an anode and a cathode each made of an electrically-conductive material such as copper.
  • the anode and cathode are located on a substrate of silicon dioxide.
  • a radiation- sensitive component is formed between and is electrically connected to the anode and cathode.
  • the radiation-sensitive component includes a thin film of allyl diglycol carbonate plastic polymer (i.e. , Ci 2 H 8 0 7 ; also known as "CR-39”) having a density of 1 .3 g/cm 3 and an incident surface area for reception of neutron radiation of about 1 .0 m 2 .
  • a plurality of electrically-conductive, single-walled carbon nanotubes are embedded in the CR-39. The concentration of the carbon nanotubes within the radiation-sensitive component is 3% by weight.
  • An initial reading of current across the radiation-sensitive component of the neutron radiation sensor is taken by applying a voltage of 1 .5 kV to the radiation-sensitive component at a frequency of 5 kHz.
  • the neutron radiation sensor is then placed at a distance of approximately 4 cm from a possible neutron radiation source and the same voltage of 1 .5 kV at 5 kHz is applied to the radiation- sensitive component.
  • a computing device is used to measure the current across the radiation-sensitive component and compare the measured current to the initial current every second. The comparison result is then referenced against the standard curve indicating doses of neutron radiation corresponding to changes in electrical current across the radiation-sensitive component. Based on the standard curve, a neutron radiation dosage is determined.
  • a neutron radiation sensor is provided with an anode and a cathode each made of an electrically-conductive material such as gold.
  • the anode and cathode are located on a substrate of glass.
  • a radiation-sensitive component is formed between and is electrically connected to the anode and cathode.
  • the radiation-sensitive component includes a thin film of poly(vinylcarbazole) having a density of 1 .2 g/cm 3 and an incident surface area for reception of neutron radiation of about 100 cm 2 .
  • a plurality of electrically-conductive graphenes are embedded in the poly(vinylcarbazole). The concentration of the graphenes within the radiation- sensitive component is 4% by weight.
  • the neutron radiation sensor is placed at a distance of approximately 6 cm from a possible neutron radiation source and a voltage of 1 .0 kV at 4 kHz is applied to the radiation-sensitive component. A similar voltage is applied to a pair of reference electrodes of a non-exposed radiation-sensitive component having a similar composition to that of the neutron radiation sensor.
  • the computing device is used to measure the current across the radiation-sensitive component of the neutron radiation sensor and compare the measured current to a reference current measured across the non-exposed radiation-sensitive component every 0.5 seconds. The comparison result is then referenced against the standard curve indicating doses of neutron radiation corresponding to changes in electrical current across the radiation-sensitive component. Based on the standard curve, a neutron radiation dosage is determined.
  • any two components herein combined to achieve a particular functionality can be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedial components.
  • any two components so associated can also be viewed as being “operably connected”, or “operably coupled”, to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being “operably couplable”, to each other to achieve the desired functionality.
  • operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

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

La présente invention concerne une technologie qui fournit un appareil de détection de rayonnement de neutrons. L'appareil de détection de rayonnement comprend une anode, une cathode et un élément sensible au rayonnement. L'élément sensible au rayonnement est positionné entre l'anode et la cathode et est connecté électriquement à celles-ci. La conductivité électrique de l'élément sensible au rayonnement est conçue pour évoluer en réponse à l'exposition au rayonnement de neutrons.
PCT/US2013/032034 2013-03-15 2013-03-15 Procédé et système de détection d'un rayonnement de neutrons WO2014142961A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2013/032034 WO2014142961A1 (fr) 2013-03-15 2013-03-15 Procédé et système de détection d'un rayonnement de neutrons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2013/032034 WO2014142961A1 (fr) 2013-03-15 2013-03-15 Procédé et système de détection d'un rayonnement de neutrons

Publications (1)

Publication Number Publication Date
WO2014142961A1 true WO2014142961A1 (fr) 2014-09-18

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Family Applications (1)

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PCT/US2013/032034 WO2014142961A1 (fr) 2013-03-15 2013-03-15 Procédé et système de détection d'un rayonnement de neutrons

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WO (1) WO2014142961A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060138345A1 (en) * 2003-06-27 2006-06-29 Gesellschaft Tur Schwerionentorschung Mbh Dosimeter for the detection of highly energy neutron radiation
US20060138340A1 (en) * 2003-09-30 2006-06-29 The Regents Of The University Of California Neutron and gamma detector using an ionization chamber with an integrated body and moderator
US20080169921A1 (en) * 2002-12-23 2008-07-17 Gentag, Inc. Method and apparatus for wide area surveillance of a terrorist or personal threat
WO2011025853A1 (fr) * 2009-08-27 2011-03-03 Mcgregor Douglas S Détecteurs de neutrons à gaz dont l’efficacité de détection est améliorée
US20110081724A1 (en) * 2009-10-06 2011-04-07 Massachusetts Institute Of Technology Method and apparatus for determining radiation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080169921A1 (en) * 2002-12-23 2008-07-17 Gentag, Inc. Method and apparatus for wide area surveillance of a terrorist or personal threat
US20060138345A1 (en) * 2003-06-27 2006-06-29 Gesellschaft Tur Schwerionentorschung Mbh Dosimeter for the detection of highly energy neutron radiation
US20060138340A1 (en) * 2003-09-30 2006-06-29 The Regents Of The University Of California Neutron and gamma detector using an ionization chamber with an integrated body and moderator
WO2011025853A1 (fr) * 2009-08-27 2011-03-03 Mcgregor Douglas S Détecteurs de neutrons à gaz dont l’efficacité de détection est améliorée
US20110081724A1 (en) * 2009-10-06 2011-04-07 Massachusetts Institute Of Technology Method and apparatus for determining radiation

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