WO1993006602A1 - Bande de plastique absorbant les neutrons - Google Patents

Bande de plastique absorbant les neutrons Download PDF

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Publication number
WO1993006602A1
WO1993006602A1 PCT/DE1992/000811 DE9200811W WO9306602A1 WO 1993006602 A1 WO1993006602 A1 WO 1993006602A1 DE 9200811 W DE9200811 W DE 9200811W WO 9306602 A1 WO9306602 A1 WO 9306602A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
parts
plastic sheet
neutron
sheet according
Prior art date
Application number
PCT/DE1992/000811
Other languages
German (de)
English (en)
Inventor
Till DÜTZMANN
Heinz Werner Gabriel
Herbert Ledermann
Original Assignee
Braas Gmbh
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 Braas Gmbh filed Critical Braas Gmbh
Publication of WO1993006602A1 publication Critical patent/WO1993006602A1/fr

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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
    • G21F1/02—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 invention relates to a plastic web made of high molecular weight neutron moderating polymers with a boron containing neutron absorbing additive.
  • DE-OS 39 30 887.1 discloses a neutron absorbing material in which boron is embedded in predominantly linear polyethylene with a mean molecular weight of at least 2.5 * 10 ° g / mol measured by viscometry.
  • the boron is in the form of boron carbide. This material is suitable for the absorption of thermal neutrons with an energy of less than 1 eV.
  • a multilayer film web which contains lead or another heavy material in the form of heavy material particles, in particular lead particles, in one layer.
  • This film web is suitable for shielding gamma rays.
  • first additives with high contents of neutrons scattering heavy metals such as manganese, lead, tungsten or iron, preferably manganese dioxide
  • second additives with high contents of broadband neutron absorbers namely boron, gadolinium and manganese, preferably boron carbide, gadolinium oxide and manganese dioxide are contained.
  • Plastic sheeting is based on the combination of moderating, scattering and absorbing materials. As a result of the presence of aggregates scattering neutrons, the distance traveled by scattered neutrons in the plastic web is considerably larger than its geometric path
  • the aggregates should be as homogeneously distributed and finely divided as possible, for example have an average grain diameter of less than 3 ⁇ m and a maximum grain size of 40 ⁇ m.
  • hafnium which absorbs thermal neutrons.
  • Suitable polymers are hydrogen-free compounds, preferably high molecular weight polyisobutylene with a Staudinger index in the range between 415 cm / g and 480 cm 3 / g.
  • the mechanical properties of the plastic sheet can be increased by adding ethylene vinyl acetate (EVA) with a vinyl content of 9% by weight and a melt index 190/2 of 2.5 g / 10 min or by adding linear low density polyethylene (VLDPE ) with a melt index can be improved by 0.9 g / 10 min and a Vi cat temperature by 90 ° C.
  • Low-molecular liquid polyisobutylene with a kinematic viscosity of 7600 mm 2 / s is recommended as a lubricant.
  • Polynuclear, phenolic or substituted diamines have proven effective as anti-aging agents.
  • a plastic sheet based on polyisobutene is easy to process. All membrane seams can be connected to each other in a material-homogeneous manner by hot gas welding or by simple solvent welding. The seaming technique can also be carried out with the aid of self-adhesive tapes which are likewise provided with radiation-absorbing additives, for example based on buti rubber and / or thermoplastic elastomers.
  • the plastic web can be produced with the aid of known kneading technology in a rubber kneader or with dry blend mixing technology and by the extrusion or calendering process. Multi-layer webs of greater thickness can also be easily produced using the calender or Auma process. That way
  • Multi-layer webs can be produced with layers arranged in any order, which contain different neutron absorbing or scattering additives.
  • a single- or multilayer web can be laminated with strength-enhancing fleece, which contains, for example, polyester or polypropylene staple or staple fibers.
  • the lamination can be carried out thermally or with the aid of a fleece adhesive, for example based on SBR atices.
  • a laminated plastic sheet can be glued to the substrate with common adhesives, for example with SBR or CR-based contact adhesives or with bituminous adhesives.
  • the plastic sheet which can preferably be produced with a thickness of around 3 mm, is a prefabricated, waterproof, UV-stable, flexible, easy to process and deep-drawable sealing sheet.
  • inert, inorganic fillers such as coated or uncoated calcium carbonate and / or silicate fillers, for example with an average grain diameter between 1 ⁇ m and 3 ⁇ m and a maximum grain size of 40 ⁇ m, can be added in order to specifically influence application-specific properties.
  • the plastic web according to the invention can be colored with coloring inorganic pigments such as surface-treated titanium dioxide, zinc oxide, chromium CHD oxide and / or iron oxide, with organic pigments or with carbon black or a mixture of pigments.
  • coloring inorganic pigments such as surface-treated titanium dioxide, zinc oxide, chromium CHD oxide and / or iron oxide, with organic pigments or with carbon black or a mixture of pigments.
  • the area of application of a plastic sheet according to the invention is primarily in the case of shielding measures in the industrial area on permanently installed or transportable facilities, for example in the nuclear power plant area, on pipelines, on pump and box systems or also in the covering of heaps of uranium mining.
  • the plastic sheet according to the invention is also suitable for shielding and sealing waste containers, roofs exposed buildings, from road, rail or aircraft.
  • the plastic sheet is also suitable for the production of protective clothing and packaging materials.
  • a plastic sheet according to the invention has the following
  • Unsaturated, short-chain, polymerizable compounds such as maleates or acrylates are suitable for this.
  • the barium and / or lead-containing plastic sheet suitable for the absorption of neutrons can be imparted with additional gamma rays by means of additives.
  • additives Barium sulfate is preferred because, on the one hand, it is cheaper in weight than lead compounds and, on the other hand, because of its sulfur content, it enables dosimetric determination of the radiation exposure that has occurred.
  • a plastic web that absorbs both neutrons and gamma rays has the following components:
  • the plastic sheet can contain 10-30 parts by weight of a pigment mixture.
  • the plastic sheet which in this example is colored dark olive green, contains the following components:
  • the dose is weakened to ⁇ 50% with fast neutrons
  • the dark brown colored plastic sheet in this example which is able to absorb both neutrons and gamma rays, contains the following components:
  • brown pigment mixture iron oxides, titanium dioxide, carbon black
  • gadolinium oxide 0.5 parts by weight of gadolinium oxide.
  • the Shore A hardness is approx. 80.

Abstract

L'invention concerne une bande de plastique constituée de polymères à haut point moléculaire et modérant les neutrons, comportant un additif contenant du bore et absorbant les neutrons. Pour obtenir une bande de plastique qui soit aussi légère que possible et qui absorbe les neutrons biologiquement fortement nocifs présentant une énergie comprise dans la plage de 0,1 à 2 MeV, il est proposé que la bande de plastique contienne des premiers additifs possédant des teneurs élevées en métaux lourds dispersant les neutrons, tels que le manganèse, le plomb, le tungstène ou le fer, et de préférence la pyrolusite, et des deuxièmes additifs possédant des teneurs élevées en absorbeurs de neutron à large spectre, tels que le bore, le gadolinium et le manganèse, et de préférence le carbure de bore, l'oxyde de gadolinium et la pyrolusite. Le polymère modérateur recommandé est un polyisobutylène à haut point moléculaire avec un indice limite de viscosité se situant dans la plage comprise entre 415 cm3/g et 480 cm3/g. L'effet d'absorption des neutrons de la bande de plastique décrite repose sur la combinaison de substances modératrices, dispersantes et absorbantes. La présence d'additifs dispersant les neutrons assure que la trajectoire parcourue dans la bande de plastique par les neutrons dispersés est sensiblement plus longue que l'épaisseur géométrique des couches, de sorte que la probabilité de la collision avec un noyau atomique absorbant est notablement accrue.
PCT/DE1992/000811 1991-09-20 1992-09-17 Bande de plastique absorbant les neutrons WO1993006602A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4131274.0 1991-09-20
DE19914131274 DE4131274C2 (de) 1991-09-20 1991-09-20 Neutronenabsorbierende Kunststoffbahn

Publications (1)

Publication Number Publication Date
WO1993006602A1 true WO1993006602A1 (fr) 1993-04-01

Family

ID=6441036

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/000811 WO1993006602A1 (fr) 1991-09-20 1992-09-17 Bande de plastique absorbant les neutrons

Country Status (2)

Country Link
DE (1) DE4131274C2 (fr)
WO (1) WO1993006602A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925091B1 (en) 1997-11-19 2005-08-02 Telefonaktiebolaget Lm Ericsson (Publ) Message transmission system
CN106128537A (zh) * 2016-07-29 2016-11-16 刘世超 一种防辐射紫铜铅板

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9402609U1 (de) * 1994-02-17 1994-08-11 Thiess Axel Dipl Holzw Mehrschichtiges, flexibles Röntgenschutzmaterial nach DIN - 6813
US5556898A (en) * 1995-01-11 1996-09-17 Elf Atochem North America, Inc. Radiation-shielding polymeric compositions
AT405773B (de) * 1996-05-08 1999-11-25 Hascic Wladimir Dr Strahlenschutzmaterial mit neutronen-absorber
DE19645193A1 (de) * 1996-11-02 1998-05-07 Bluecher Gmbh Radon adsorbierende Bauteile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1251998A (fr) * 1959-03-16 1961-01-20 Ass Lead Mfg Ltd Perfectionnement aux blindages de protection contre les radiations
US2983821A (en) * 1957-12-09 1961-05-09 Cap Ferdinand Protective device
GB920128A (en) * 1958-09-02 1963-03-06 Elektroschmelzwerke Kempten G The screening of neutrons and rays
DE1944873A1 (de) * 1966-08-09 1970-09-17 Marxen Friedrich Polymerisationsmaterialien mit einer abschirmenden Wirkung gegen radioaktive Strahlung
EP0242227A2 (fr) * 1986-04-17 1987-10-21 Minnesota Mining And Manufacturing Company Matériau élastomère de protection neutronique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8613671U1 (fr) * 1986-05-21 1987-01-08 Michel, Wolfgang
DE3930887A1 (de) * 1989-09-15 1991-03-28 Hoechst Ag Neutronenabsorbierendes material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983821A (en) * 1957-12-09 1961-05-09 Cap Ferdinand Protective device
GB920128A (en) * 1958-09-02 1963-03-06 Elektroschmelzwerke Kempten G The screening of neutrons and rays
FR1251998A (fr) * 1959-03-16 1961-01-20 Ass Lead Mfg Ltd Perfectionnement aux blindages de protection contre les radiations
DE1944873A1 (de) * 1966-08-09 1970-09-17 Marxen Friedrich Polymerisationsmaterialien mit einer abschirmenden Wirkung gegen radioaktive Strahlung
EP0242227A2 (fr) * 1986-04-17 1987-10-21 Minnesota Mining And Manufacturing Company Matériau élastomère de protection neutronique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925091B1 (en) 1997-11-19 2005-08-02 Telefonaktiebolaget Lm Ericsson (Publ) Message transmission system
CN106128537A (zh) * 2016-07-29 2016-11-16 刘世超 一种防辐射紫铜铅板
CN106128537B (zh) * 2016-07-29 2019-01-08 何天泽 一种防辐射紫铜铅板

Also Published As

Publication number Publication date
DE4131274A1 (de) 1993-04-01
DE4131274C2 (de) 1995-05-11

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