EP1120795A1 - Couverture de protection contre les radiations composée de couches stratifiées et de poids réduit - Google Patents

Couverture de protection contre les radiations composée de couches stratifiées et de poids réduit Download PDF

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Publication number
EP1120795A1
EP1120795A1 EP01300625A EP01300625A EP1120795A1 EP 1120795 A1 EP1120795 A1 EP 1120795A1 EP 01300625 A EP01300625 A EP 01300625A EP 01300625 A EP01300625 A EP 01300625A EP 1120795 A1 EP1120795 A1 EP 1120795A1
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EP
European Patent Office
Prior art keywords
layer
structure recited
materials
layers
radiation
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.)
Withdrawn
Application number
EP01300625A
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German (de)
English (en)
Inventor
John Kesapradist
Mitch Mehlman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxar Space LLC
Original Assignee
Space Systems Loral LLC
Loral Space Systems Inc
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 Space Systems Loral LLC, Loral Space Systems Inc filed Critical Space Systems Loral LLC
Publication of EP1120795A1 publication Critical patent/EP1120795A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/12—Laminated shielding materials
    • G21F1/125—Laminated shielding materials comprising metals
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/10—Organic substances; Dispersions in organic carriers
    • G21F1/103—Dispersions in organic carriers
    • G21F1/106—Dispersions in organic carriers metallic dispersions

Definitions

  • the present invention relates generally to radiation shielding materials, and more particularly, to improved laminated lightweight radiation shielding materials.
  • laminated lightweight radiation shielding materials such as may be used in a spacecraft environment, that overcome limitations of conventional materials, and provide the opportunity for significant mass savings and/or increased reliability.
  • a lightweight radiation shielding structure (10) comprising: a first layer (11) comprised of one or more materials having low atomic number/atomic weight ratio that preferentially attenuates electron and proton radiation, while possibly generating Bremsstrahlung radiation in the process; a second layer (12) comprised of one or more materials with high atomic number squared/atomic weight ratio that preferentially attenuates Bremsstrahlung radiation, while possibly generating photo-electrons in the process; and a third layer (13) comprised of one or more materials having low atomic number/atomic weight ratio that attenuates photo-electrons emitted from the second layer, as well as electrons and protons that get through the first and second layers.
  • the present invention provides for a laminated material or structure that provides radiation shielding for spacecraft components in orbit against electron and proton radiation.
  • the laminated material provides equivalent radiation shielding for spacecraft components in orbit against electron and proton radiation at a greatly reduced mass.
  • the laminated material may be configured to provide greatly increased radiation shielding at equivalent mass.
  • the laminated material or structure comprises three laminated layers.
  • the first layer is made of one or more materials having a low Z/A (atomic number/atomic weight) ratio that preferentially attenuate electron and proton radiation, although they may generate Bremsstrahlung radiation in the process.
  • the second layer is made of one or more materials with a high Z 2 /A (atomic number squared/atomic weight) ratio that preferentially attenuate Bremsstrahlung radiation, although they may generate photo-electrons in the process.
  • the third layer is made of one or more materials having a low Z/A (atomic number/atomic weight) ratio that attenuate photo-electrons emitted from the second layer, as well as electrons and protons that pass through the first and second layers.
  • the unique layered structure of the present invention sequentially attenuates electrons, protons, and secondarily generated radiation.
  • the present invention minimizes mass while maximizing shielding and providing an optimum ratio range of shielding effectiveness per unit mass.
  • the design of the laminated material takes into account the effects of thermal expansion mismatch between the layers, thus minimizing the risks of delamination and warpage.
  • the present invention uses commonly available materials.
  • the present invention is lower in mass than aluminum, for example.
  • the present invention does not require special formulations of materials, such as the Physical Sciences design mentioned in the Background section.
  • the present invention uses high atomic number material in the center for maximum efficacy.
  • the present invention preferably uses a symmetrical design to minimize warpage, unlike the Composite Optics design mentioned in the Background section.
  • Fig. 1 illustrates an exemplary laminated lightweight radiation shielding material 10 or structure 10 in accordance with the principles of the present invention.
  • the laminated lightweight radiation shielding material 10 or structure 10 comprises three layers 11, 12, 13.
  • the first layer 11 comprises one or more materials having a low Z/A (atomic number/atomic weight) ratio, such as boron, graphite, aramid, or other polymer-based fiber-reinforced non-metallic matrix composite materials.
  • the materials forming the first layer 11 may be fabricated from commercially available composite materials, with no modification.
  • the first layer may be comprised of sub-layers of differing low Z/A materials.
  • the first layer 11 preferentially attenuates electron and proton radiation, but may generate Bremsstrahlung (secondary) radiation in the process.
  • the second layer 12 comprises one or more materials with a high Z 2 /A (atomic number squared/atomic weight) ratio, such as gold, lead, silver, titanium, tantalum, or tungsten.
  • the materials forming the second layer 12 may be fabricated from commercially available metal foils, for example.
  • the second layer may be comprised of fiber-reinforced metallic or non-metallic matrix composite where the fibers have been coated with high Z 2 /A material, such as tantalum or tungsten.
  • the second layer may be comprised of sub-layers of differing high Z 2 /A materials, although other materials may be between the sub-layers of high Z 2 /A materials to bond them together.
  • the second layer 12 preferentially attenuates Bremsstrahlung radiation, but may generate photo-electrons in the process. It is preferred that the material forming the second layer 12 have low tensile modulus and low tensile strength, or a thermal expansion that approximates that of the first and third layers 11, 13 to minimize interlaminar stresses.
  • the third layer 13 comprises one or more materials having a low Z/A (atomic number/atomic weight) ratio.
  • the third layer 13 may be made of the same material as the first layer.
  • the third layer may be comprised of sub-layers of differing low Z/A materials.
  • the third layer 13 attenuates photo-electrons emitted from the second layer 12, as well as electrons and protons that get through the first and second layers.
  • the thickness and materials properties of the third layer 13 are preferably, but not necessarily, the same as the thickness and materials properties of the first layer 11 to minimize warpage of the laminated lightweight radiation shielding material 10 or structure 10. Thermal expansion of the first and third layers 11, 13 may also be tailored to approximate that of the second layer to minimize warpage of the laminated material.
  • the laminated radiation shielding material 10 or structure 10 may be fabricated using a hot press, an oven, or an autoclave. Layers and sub-layers of the laminated radiation shielding material 10 may be co-cured together or secondarily bonded together. Fiber fabrics preimpregnated with uncured non-metallic matrix may be used in the first and third layers 11, 13. The uncured non-metallic matrix may be used as and adhesive to bond to the second layer 12 during a co-cure process. If metal foils are to be used in the second layer 12, the surface of the metal foils must be prepared for enhanced adhesion to the adjacent layers of the laminated material. This preparation may be through abrasion, chemical etching, and/or application of primer. Fiber fabrics preimpregnated with uncured non-metallic matrix may be used in the second layer 12. In which case, it would be advantageous to co-cure the three layers 11, 12, 13 together at the same time.
  • End covers for existing enclosures may easily be made from the laminated radiation shielding material 10 or structure 10 that is fabricated in planar form.
  • the shielding material 10 may be molded into complex shapes using appropriate tooling. In such cases, all three layers 11, 12, 13 of the shielding material 10 conform to the contours of the complex shape, as is illustrated in Fig. 2.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Laminated Bodies (AREA)
EP01300625A 2000-01-24 2001-01-24 Couverture de protection contre les radiations composée de couches stratifiées et de poids réduit Withdrawn EP1120795A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48963500A 2000-01-24 2000-01-24
US489635 2000-01-24

Publications (1)

Publication Number Publication Date
EP1120795A1 true EP1120795A1 (fr) 2001-08-01

Family

ID=23944649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01300625A Withdrawn EP1120795A1 (fr) 2000-01-24 2001-01-24 Couverture de protection contre les radiations composée de couches stratifiées et de poids réduit

Country Status (2)

Country Link
EP (1) EP1120795A1 (fr)
JP (1) JP2001208891A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102479562A (zh) * 2010-11-25 2012-05-30 上海交通大学医学院附属第三人民医院 一种防辐射材料
CN103971776A (zh) * 2014-04-30 2014-08-06 大连理工高邮研究院有限公司 一种用于核辐射防护的软碳纤维基隔热材料及其制备方法
WO2015113160A1 (fr) * 2014-01-30 2015-08-06 Magellan Aerospace, Winnipeg A Division Of Magellan Aerospace Limited Structure composite de blindage pour applications spatiales
US9640288B1 (en) 2015-11-30 2017-05-02 Space Systems/Loral, Llc Flexible radiation shield
CZ307676B6 (cs) * 2014-05-15 2019-02-13 5M S.R.O. Kompozitní strukturní panel pro miniaturní krychlový kosmický satelit
GB2593530A (en) * 2020-03-27 2021-09-29 Bae Systems Plc Impact shield structures
US11358375B1 (en) 2020-11-04 2022-06-14 Space Systems/Loral, Llc Flexible micrometeoroid shield

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2509480A (en) * 2012-07-06 2014-07-09 Qioptiq Ltd Radiation stable shield
CN106601319B (zh) * 2016-12-09 2019-05-14 北京师范大学 氧化石墨烯-铅复合材料、其制备方法及用途

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242295A1 (fr) * 1986-04-16 1987-10-21 AEROSPATIALE Société Nationale Industrielle Boîtier de protection de circuits électroniques, durci vis-à-vis des rayons X
US4923741A (en) * 1988-06-30 1990-05-08 The United States Of America As Represented By The Administrator, National Aeronautics And Space Administration Hazards protection for space suits and spacecraft
US5324952A (en) * 1992-07-10 1994-06-28 Ball Corporation Radiation shielding for spacecraft components

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242295A1 (fr) * 1986-04-16 1987-10-21 AEROSPATIALE Société Nationale Industrielle Boîtier de protection de circuits électroniques, durci vis-à-vis des rayons X
US4923741A (en) * 1988-06-30 1990-05-08 The United States Of America As Represented By The Administrator, National Aeronautics And Space Administration Hazards protection for space suits and spacecraft
US5324952A (en) * 1992-07-10 1994-06-28 Ball Corporation Radiation shielding for spacecraft components

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SPIETH B D ET AL: "Shielding electronics behind composite structures", 1998 IEEE NUCLEAR AND SPACE RADIATION EFFECTS CONFERENCE (NSREC'98), NEWPORT BEACH, CA, USA, 20-24 JULY 1998, vol. 45, no. 6, pt.1, IEEE Transactions on Nuclear Science, Dec. 1998, IEEE, USA, pages 2752 - 2757, XP002163551, ISSN: 0018-9499 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102479562A (zh) * 2010-11-25 2012-05-30 上海交通大学医学院附属第三人民医院 一种防辐射材料
CN102479562B (zh) * 2010-11-25 2016-05-11 上海交通大学医学院附属第三人民医院 一种防辐射材料
WO2015113160A1 (fr) * 2014-01-30 2015-08-06 Magellan Aerospace, Winnipeg A Division Of Magellan Aerospace Limited Structure composite de blindage pour applications spatiales
CN103971776A (zh) * 2014-04-30 2014-08-06 大连理工高邮研究院有限公司 一种用于核辐射防护的软碳纤维基隔热材料及其制备方法
CZ307676B6 (cs) * 2014-05-15 2019-02-13 5M S.R.O. Kompozitní strukturní panel pro miniaturní krychlový kosmický satelit
US9640288B1 (en) 2015-11-30 2017-05-02 Space Systems/Loral, Llc Flexible radiation shield
GB2593530A (en) * 2020-03-27 2021-09-29 Bae Systems Plc Impact shield structures
US11358375B1 (en) 2020-11-04 2022-06-14 Space Systems/Loral, Llc Flexible micrometeoroid shield

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Publication number Publication date
JP2001208891A (ja) 2001-08-03

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