WO2008035711A1 - Lentille résistant aux rayonnements et protection contre les rayonnements, module de lentille et caméra de télévision pour environnement à forts rayonnements utilisant la lentille résistant aux rayonnements et la protection contre les rayonnements - Google Patents

Lentille résistant aux rayonnements et protection contre les rayonnements, module de lentille et caméra de télévision pour environnement à forts rayonnements utilisant la lentille résistant aux rayonnements et la protection contre les rayonnements Download PDF

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Publication number
WO2008035711A1
WO2008035711A1 PCT/JP2007/068185 JP2007068185W WO2008035711A1 WO 2008035711 A1 WO2008035711 A1 WO 2008035711A1 JP 2007068185 W JP2007068185 W JP 2007068185W WO 2008035711 A1 WO2008035711 A1 WO 2008035711A1
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Prior art keywords
radiation
lens
resistant
lens module
transmittance
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PCT/JP2007/068185
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English (en)
Japanese (ja)
Inventor
Eishi Ikuta
Satoshi Kuretake
Makoto Kumatoriya
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Nuclear Fuel Industries, Ltd.
Murata Manufacturing Co., Ltd.
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Application filed by Nuclear Fuel Industries, Ltd., Murata Manufacturing Co., Ltd. filed Critical Nuclear Fuel Industries, Ltd.
Publication of WO2008035711A1 publication Critical patent/WO2008035711A1/fr

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    • 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
    • G21F1/06—Ceramics; Glasses; Refractories
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3215—Barium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3293—Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/79—Non-stoichiometric products, e.g. perovskites (ABO3) with an A/B-ratio other than 1
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9646—Optical properties
    • C04B2235/9653—Translucent or transparent ceramics other than alumina

Definitions

  • the present invention relates to a radiation resistant lens and a radiation shield used for industrial television cameras and monitoring windows for monitoring and inspecting equipment and facilities in a high radiation environment such as nuclear power plants and accelerator facilities. Is.
  • ITV industrial TV cameras
  • image sensors such as CCD and CMOS
  • radiation-resistant ITVs that use radiation-resistant image sensors are used for imaging tubes from the viewpoint of radiation resistance of image sensors! / RU
  • optical systems that are not only radiation-resistant for image sensors and other electronic circuits need to be radiation-resistant. Therefore, in recent years, there are almost no manufacturers and it has become difficult to obtain.
  • It is configured by combining multiple single lenses made of materials with different refractive indexes, controlling the number to various values.
  • quartz glass can also be used as a radiation-resistant lens material. It has a refractive index of 1.458 and an Abbe number of 67.7. It was extremely difficult to design and manufacture radiation-resistant lens modules with corrected axial chromatic aberration, and the use of radiation-resistant lens materials with high refractive index and low dispersion was indispensable.
  • the Mg and Ta sites of the Ba (Mg, Ta) 0 series material are replaced with Sn and Zr.
  • Patent Document 1 JP-A-2004-75512
  • An object of the present invention is to provide a radiation-resistant lens and a radiation shield made of an optical material that has a high refractive index but hardly causes browning due to radiation, and a lens module using these. Joule is to provide a high radiation environment TV camera.
  • a lens module including at least one of the radiation resistant lenses is configured.
  • a lens module in which the radiation-resistant lens is an achromatic lens can be configured.
  • the present invention comprises (a) a translucent ceramic obtained by sintering a material having a composition represented by the general formula Ba KSn Zr) Mg Ta) ⁇ O, wherein W is electrically neutral.
  • X, y, z force S, x + y + z l, 0. 100 ⁇ x ⁇ 0. 700, 1. 80 ⁇ z / y ⁇ 2
  • the radiation shield can constitute a window of a facility or apparatus for monitoring or checking in a high radiation environment.
  • a lens module including one or more of the radiation shields can be configured.
  • a television camera for a high radiation environment for performing monitoring or inspection in a high radiation environment having the above radiation shield or lens module can be configured.
  • FIG. 1 Results for the conventional translucent ceramics (control) in the transmittance change test by gamma ray irradiation of the radiation translucent ceramics in the first embodiment of the present invention. (Horizontal axis: wavelength nm, vertical axis: linear transmittance%).
  • FIG. 2 The results for the radiation-resistant translucent ceramics of No. l composition when the transmittance change test by gamma irradiation of the radiation-transparent translucent ceramics in the first embodiment of the present invention was performed.
  • 1 is a diagram (horizontal axis: wavelength nm, vertical axis: linear transmittance%).
  • FIG. 3 The results for the radiation-resistant translucent ceramics of No. 2 composition when the transmittance change test by gamma irradiation of the radiation-transparent translucent ceramics in the first embodiment of the present invention were performed.
  • 1 is a diagram (horizontal axis: wavelength nm, vertical axis: linear transmittance%).
  • FIG. 4 The results for the radiation-resistant translucent ceramic of No. 3 composition when the transmittance change test by gamma irradiation of the radiation-transparent ceramic in the first embodiment of the present invention was performed.
  • 1 is a diagram (horizontal axis: wavelength nm, vertical axis: linear transmittance%).
  • FIG. 5 shows the results for the radiation-resistant translucent ceramics of No. 4 composition when the transmittance change test by gamma ray irradiation of the radiation-transparent ceramics in the first embodiment of the present invention was performed.
  • 1 is a diagram (horizontal axis: wavelength nm, vertical axis: linear transmittance%).
  • FIG. 6 The relative transmittance of the No. l composition radiation-resistant translucent ceramic in the first embodiment of the present invention and the conventional translucent ceramic as a control compared to that of optical glass.
  • the horizontal axis wavelength nm
  • the vertical axis specific transmittance
  • (a) shows the radiation-resistant and light-transmitting ceramics
  • (b) shows the case of the conventional translucent ceramics. Is.
  • FIG. 13 is a schematic configuration diagram of a radiation-resistant lens according to a second embodiment of the present invention.
  • FIG. 14 is a schematic configuration diagram of an acrylic resin lens.
  • FIG. 15 is a schematic configuration diagram showing a combination of a radiation shield according to a fourth embodiment of the present invention and a television camera lens module.
  • Diagrams (a) to (c) for the three LT single crystals according to the sixth embodiment of the present invention in which the relative transmittance by gamma ray irradiation is shown in comparison with optical glass (horizontal axis: Wavelength nm, vertical axis : Specific transmittance).
  • FIG. 18 is a schematic diagram of a lens module of a lens module including a radiation-resistant translucent ceramic lens and a YAG polycrystalline lens shown in Example 1 according to Example 7 of the present invention; b) is a diagram showing the MTF of the lens module (horizontal axis: image height mm, vertical axis: MTF).
  • FIG. 19 shows a lens module composed of a YAG polycrystalline lens and an LT single crystal lens according to the eighth embodiment of the present invention.
  • (A) is a schematic configuration diagram of the lens module, and (b) is an MTF of the lens module. It is a diagram (horizontal axis: image height mm, vertical axis: MTF).
  • the radiation resistant lens in the present invention is a result of various studies on radiation resistance performance by the present inventors based on translucent ceramics having a high refractive index and excellent optical characteristics.
  • the general formula Ba ⁇ (Sn Zr) Mg For translucent ceramics represented by Ta ⁇ O, the direct thickness after gamma irradiation u
  • the translucent ceramic represented by the above general formula is an example of the most excellent optical characteristics at present, such as a high refractive index of around 2.07 and a linear transmittance of 75.8%.
  • those disclosed in the above-mentioned Patent Document 1 have the highest! /, Linear transmittance, and translucent ceramics shown as a conventional type in the examples described later. Is about 0.67.
  • Translucent ceramics with excellent optical properties the decrease in linear transmittance due to browning after gamma irradiation is not suitable for practical use in extremely high radiation environments.
  • V when the decrease in linear transmittance after irradiation with gamma rays is reduced, V, ⁇ from translucent ceramics having radiation resistance performance, environmental conditions where radiation is irradiated.
  • a radiation-resistant lens that can maintain excellent optical characteristics. If such a radiation-resistant lens is used, the optical system and the apparatus such as the camera are also excellent in the optical characteristics! /, And the linear transmittance decrease due to the browning of the thing! /, The conventional translucent ceramics A longer life can be achieved than when a lens is used.
  • the specific range of each composition is a condition for the obtained translucent ceramics to have a sufficient transmittance that can be used as a lens and a translucent radiation shielding plate in a non-gamma irradiation state.
  • the present inventors are not limited to the above translucent ceramics, but various optical materials. Search for materials that have radiation resistance, and as a result, YAG (yttrium 'aluminum' galnet) polycrystals also have radiation resistance that reduces the reduction in linear transmittance of light after gamma irradiation! / I found out that. Although YAG crystals are slightly inferior in optical properties such as refractive index to translucent ceramics, they can be used well in cameras and other optical systems, and it is possible to provide radiation-resistant lenses that can be used for a long time in a radiation irradiation environment. To do.
  • the inventors of the present invention have improved radiation resistance performance when LT (lithium tantalate) single crystals are reduced in linear light transmittance reduction after gamma irradiation. I found out that it was equipped.
  • the LT single crystal has excellent optical suitability with the same refractive index as the above-mentioned translucent ceramics, and can provide an excellent radiation-resistant lens that can be used for a long time in a radiation irradiation environment. .
  • the LT single crystal can improve the radiation resistance performance by controlling its Li / Ta molar ratio.
  • the LT / Li monocrystal has a Li / Ta monolayer of 0.40 / 490 / 0.510— Control within the range of 0. 498/0. 5 02.
  • doping with MgO to the LT single crystal can further improve radiation resistance.
  • the doping amount of MgO is such that a heterogeneous phase that reduces the transmittance is not generated and a single phase can be maintained.
  • the amount below 3 parts by mole is more preferable than desired.
  • the radiation-resistant lens made of translucent ceramic according to the present invention has a higher refractive index than other conventional optical plastics, and may constitute an optical system made of a single lens that is easy to design. Forces that can be used
  • the various optical systems that can use the radiation-resistant lens of the present invention are not limited to a single lens configuration, but can be used for a part or all of a compound lens and various lens modules.
  • the radiation-resistant lens composed of YAG polycrystal or LT single crystal force including the radiation-resistant lens made of the above-mentioned translucent ceramics, which is not only a single lens, is combined with each other or with other optical members. As a result, some or all of the compound lens or lens module can be constructed.
  • a compound lens or a lens module unit can be considered for incorporating these radiation resistant lenses into an actual device.
  • combinations with lenses and optical components made of other materials are possible.
  • a lens module that has a low refractive index and corrected axial chromatic aberration is conventionally designed and manufactured. It is possible to construct a lens module by combining other plastic lenses that are difficult to use and practical.
  • the radiation resistant lens according to the present invention or a lens module including the same as the above-described device is installed in a high radiation environment such as a nuclear power plant or an accelerator facility. It is effective to be used for the optical system of various devices, and it is possible to obtain a better monitoring image over a long period of time even in a high radiation environment, compared to the case of using a conventional lens having no radiation resistance. .
  • an industrial television camera for monitoring and inspection in a high radiation environment is one of the most suitable.
  • the present invention has been achieved. That is, the present invention realizes provision of a transparent radiation shield suitable for use in various optical systems such as monitoring and inspection devices and facilities in a high radiation environment.
  • the radiation shield of the present invention is arranged in front of a lens group of an industrial television camera used in a high radiation environment, a lens having radiation resistance performance is not used for the lens itself.
  • the solid-state imaging device and the electronic circuit in the camera head are shielded from radiation, so that the life of the television camera itself can be extended from the optical system members.
  • the radiation shield of the present invention may be used alone by being mounted on various devices such as a camera! /, But is previously placed in the foremost position in combination with other lenses and optical members.
  • a lens module may be configured. In this case, it is possible to replace the lens module unit with a TV camera.
  • the radiation shield of the present invention is less likely to cause browning! /, As a transparent radiation shield If the windows of facilities or equipment for monitoring or inspection in a high radiation environment can be configured simply by placing them in the optical system as described above, various facilities in a high radiation environment that were difficult in the past Can be easily monitored and inspected through the window.
  • a transmittance change comparison test by gamma irradiation is applied to a light-transmitting ceramic (radiation-resistant light-transmitting ceramic) having radiation resistance constituting the radiation-resistant lens of the present invention.
  • a light-transmitting ceramic radiation-resistant light-transmitting ceramic having radiation resistance constituting the radiation-resistant lens of the present invention. The case where it went is shown below.
  • the gamma-ray irradiation conditions are as follows.
  • the gamma-ray source is Co60, 100 Gy / hr at room temperature for 1 hour, 1000 Gy / hr for 1 hour, and 1000 Gy / hr for 10 hours, respectively.
  • the results for No. l to l ⁇ ⁇ 4 are shown in the diagram.
  • the conventional translucent ceramics (FIG. 1) showed coloring due to radiation, and the transmittance was significantly reduced especially at shorter wavelengths.
  • translucent ceramics with “u X x” of 0.050 or less had a very small decrease in transmittance almost entirely including the short wavelength side. This is because the content of Sn contributing to browning in the translucent ceramic made of the material represented by the general formula Ba ⁇ (S ⁇ Zr) MgTa) ⁇ O is reduced.
  • the radiation-resistant performance of the translucent ceramic with u X x ⁇ 0.050 was confirmed in this example. That is, a material satisfying u X x ⁇ 0.050 is a radiation-resistant translucent ceramic.
  • Fig. 6 (a) shows the case of radiation-resistant translucent ceramics
  • Fig. 6 (b) shows the case of conventional translucent ceramics. It is standardized with the maximum value.
  • the conventional translucent ceramics showed a decrease in transmittance as much as that of a general glass material due to coloring by radiation, but in the radiation-resistant translucent ceramics, The decrease in transmittance is greatly reduced.
  • FIG. 13 shows a single lens made of a radiation-resistant light-transmitting ceramic having the No. 1 composition shown in the first embodiment.
  • This radiation-resistant lens 1 is designed with a refractive index of 2.0 95 (n), the same lens surface curvature as the single lens 2 made of acrylic resin shown in FIG. 14, and a lens center thickness of 2 mm.
  • the acrylic lens 2 has a focal length L2 of 30.83 mm and a numerical aperture (NA) of 0.1622
  • Such a radiation-resistant lens can also be used in a single lens configuration as a lens for an industrial television camera used for monitoring, inspection, etc. of a reactor facility or apparatus in a high radiation environment.
  • the brightness of the lens can be remarkably improved as compared with that made of the acrylic resin, and a decrease in transmittance due to browning is extremely small, so that a good image can be obtained over a long period of time.
  • an achromat is formed by laminating two thin lenses each of a laminated lens A: synthetic quartz + acrylic resin, a laminated lens B: synthetic quartz + translucent ceramic, and C Calculated when the line and the F line are erased!
  • Bonded lens A [0051] Bonded lens A:
  • the Abbe numbers of synthetic quartz and acrylic resin are n and n, respectively.
  • the synthetic quartz lens and the acrylic resin lens must be a very powerful convex lens and concave lens, respectively. That is, bonding of synthetic quartz and acrylic resin
  • a lens having a very small radius of curvature and a large thickness is required, and such a lens configuration is not practical for manufacturing and correcting spherical aberration.
  • Bonded lens B [0053] Bonded lens B:
  • the Abbe numbers of synthetic quartz and translucent ceramics are n n, respectively.
  • the synthetic quartz lens and the translucent ceramic lens may be a convex lens and a concave lens, respectively, with less power.
  • a synthetic quartz / translucent ceramic bonded lens can be made of a lens having a relatively large radius of curvature and a small thickness, so that it is easy to manufacture and has a small spherical aberration.
  • (x + y + z l, 0. 100 ⁇ x ⁇ 0. 700, 1. 80 ⁇ z / y ⁇ 2. 2 0, 1. 00 ⁇ 1.05, u
  • the translucent ceramic material is similar to that used in the previous example! / Or the ability to exhibit equivalent radiation resistance. Touch with S.
  • Sintered translucent ceramics are used as radiation shields for lens modules such as industrial television cameras used in high radiation environments, for example, monitoring and inspection of nuclear reactor equipment and equipment.
  • Figure 15 shows the case where it is placed in front of the rail.
  • the lens module 11 is made of a lens member that does not have radiation resistance performance, the occurrence of browning is suppressed in front of the lens module 11, and high transmittance is maintained for a long time.
  • the radiation shielding body 10 made of the translucent ceramic that can be formed, the lens module 11 as well as the solid-state imaging device and the electronic circuit in the camera head behind the lens module 11 are shielded from radiation, so that the lens module 11 and others can be shielded.
  • the life of the TV camera itself can be increased including the optical members.
  • the radiation shield 10 may be arranged alone in various optical systems, but may be configured in advance as a part of a lens module in combination with other lens groups.
  • the half-value layer of the transparent ceramic constituting the radiation shield 10 is 14.7 mm. Therefore, for gamma rays of 1.17 MeV and 1.33 MeV emitted from 6 ° Co, the gamma ray intensity is halved and the thickness is 48.8 mm by the radiation shield 10 having a thickness of 14.7 mm. As a result, the gamma ray intensity can be reduced to 1/10, and the life of the lens module 11 and the TV camera can be extended by two or ten times, respectively.
  • such radiation shields are also effective for use in windows that monitor the inside of a high radiation environment from the outside, such as in a nuclear power plant or an accelerator facility. Can be used satisfactorily without the need to replace windows.
  • a case where the radiation resistance performance of an LT single crystal constituting the radiation resistant lens of the present invention is confirmed is shown below.
  • the following three types of LT single crystals were evaluated. That is, the first LT single crystal with a Li / Ta molar ratio of 0.485 / 0.515, the second LT single crystal with a Li / Ta monolayer of 0.495 / 0.505, and the Li / Ta monolayer of 0.
  • a lens made of an LT single crystal can be widely used as a radiation-resistant lens and a radiation shield made of an LT single crystal in a radiation irradiation environment.
  • the radiation resistance performance of the second LT single crystal is superior to that of the first LT single crystal based on the results of the specific transmittance on the short wavelength side. Therefore, the radiation resistance performance can be controlled by controlling the Li / Ta molar ratio. It was found that can be improved. By controlling the Li / Ta molar ratio within the range of 0.490 / 0.510—0.498 / 0.502, excellent body radiation performance similar to that of the second LT single crystal can be obtained.
  • the results of the 3LT single crystal also showed that radiation resistance can be improved by further doping with MgO.
  • Example ⁇ As a seventh embodiment of the present invention, as shown in the above embodiments, radiation resistant lenses made of translucent ceramics and YAG polycrystals, each of which has been found to have radiation resistance performance in the present invention, are used. An example in which a lens module is configured in combination is shown below.
  • FIG. 18 shows a lens module including the radiation-resistant translucent ceramic lens shown in Example 1 and a YAG polycrystalline lens.
  • the first, third, and fourth lenses that are meniscus lenses are radiation-resistant ceramic lenses
  • the second lens that is a biconcave lens is a YAG polycrystalline lens.
  • the MTF (Modulation Transfer Function) of this lens module is shown in the diagram of Fig. 18 (b) for each case of 5Lp (line pair) / mm, 10Lp / mm, and 20Lp / mm. Both were good, and using a radiation-resistant translucent ceramic lens and a radiation-resistant YAG polycrystalline lens, a lens module with good basic optical performance and little coloration due to radiation could be constructed. .
  • FIG. 19 (a) An example of a lens module configuration is shown in FIG.
  • YAG polycrystal lenses are placed on the first, third, and fourth lenses, which are meniscus lenses
  • LT single crystal lenses are placed on the second lens, which is a biconcave lens.
  • a lens module with a focal length f 20 mm and FNo / 2.
  • the MTF (Modulation Transfer Function) of this lens module is shown in the diagram of Fig. 19 (b) for each case of 5Lp (line pair) / mm, 10Lp / mm, and 20Lp / mm. Both were good, and using YAG polycrystal lenses and LT single crystal lenses, it was possible to construct a lens module with good basic optical performance and little coloring by radiation!

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Abstract

Cette invention concerne une lentille résistant aux rayonnements, formée d'un matériau optique, qui est moins susceptible de provoquer un brunissage dû aux rayonnements malgré son indice de réfraction élevé, et une protection contre les rayonnements, ainsi qu'un module de lentille et une caméra de télévision pour un environnement à forts rayonnements utilisant la lentille résistant aux rayonnements et la protection contre les rayonnements. La lentille résistant aux rayonnements ou la protection contre les rayonnements sont formées soit (a) d'une céramique transparente à la lumière, produite par frittage d'un matériau ayant une composition comprenant un composant principal représenté par la formule générale Ba{(SnuZr1-u)xMgyTaz)}vOw, où w est un nombre positif pour conserver la neutralité électrique, satisfaisant à x + y + z = 1, 0,100 ≤ x ≤ 0,700, 1,80 ≤ z/y ≤ 2,20, 1,00 ≤ v ≤ = 1,05 et u × x ≤ 0,05, soit (b) d'un cristal YAG, soit (c) d'un cristal de tantalate de lithium.
PCT/JP2007/068185 2006-09-20 2007-09-19 Lentille résistant aux rayonnements et protection contre les rayonnements, module de lentille et caméra de télévision pour environnement à forts rayonnements utilisant la lentille résistant aux rayonnements et la protection contre les rayonnements WO2008035711A1 (fr)

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JP2006254735 2006-09-20
JP2006-254735 2006-09-20
JP2007-210167 2007-08-10
JP2007210167A JP2008100898A (ja) 2006-09-20 2007-08-10 耐放射線レンズと放射線遮蔽体、これらを用いたレンズモジュール及び高放射線環境用テレビカメラ

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JP2001242288A (ja) * 2000-02-29 2001-09-07 Toshiba Corp 放射線遮蔽素材、同素材を用いた放射線遮蔽服、放射線遮蔽盾および放射線遮蔽機器
JP2004075517A (ja) * 2002-02-07 2004-03-11 Murata Mfg Co Ltd 透光性セラミックスならびにそれを用いた光学部品および光学素子
WO2006123740A1 (fr) * 2005-05-19 2006-11-23 Murata Manufacturing Co., Ltd. Monocristal de tantalate de lithium et dispositif optique d'enregistrement d'image
DE102005024678B3 (de) * 2005-05-30 2006-08-31 Schott Ag Verfahren zur Bestimmung von irreversiblen Strahlenschäden von optischem Material

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113045316A (zh) * 2021-04-29 2021-06-29 中国科学院上海硅酸盐研究所 一种可吸收紫外光的透明陶瓷材料及其制备方法

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