JP6664639B2 - 放射線遮蔽体 - Google Patents
放射線遮蔽体 Download PDFInfo
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- JP6664639B2 JP6664639B2 JP2016035701A JP2016035701A JP6664639B2 JP 6664639 B2 JP6664639 B2 JP 6664639B2 JP 2016035701 A JP2016035701 A JP 2016035701A JP 2016035701 A JP2016035701 A JP 2016035701A JP 6664639 B2 JP6664639 B2 JP 6664639B2
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- JP
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- Prior art keywords
- boron
- radiation shield
- sample
- water
- geopolymer
- 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.)
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- 230000005855 radiation Effects 0.000 title claims description 44
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 52
- 229910052796 boron Inorganic materials 0.000 claims description 52
- 229920000876 geopolymer Polymers 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 239000000377 silicon dioxide Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- 239000000498 cooling water Substances 0.000 description 11
- 230000005251 gamma ray Effects 0.000 description 11
- 239000002994 raw material Substances 0.000 description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 239000003513 alkali Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 6
- 229910021487 silica fume Inorganic materials 0.000 description 6
- 229910021538 borax Inorganic materials 0.000 description 5
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 5
- 235000019353 potassium silicate Nutrition 0.000 description 5
- 239000004328 sodium tetraborate Substances 0.000 description 5
- 235000010339 sodium tetraborate Nutrition 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000004111 Potassium silicate Substances 0.000 description 4
- 229910052810 boron oxide Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 4
- 229910052913 potassium silicate Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 150000007514 bases Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000000843 anti-fungal effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
メタカオリン(Al2O3・2SiO2)、シリカフューム(商標名:マイクロシリカ)(SiO2)、水酸化カリウム(KOH)、ケイ酸カリウム(K2SiO3)を基本配合とし、基本配合にホウ素源(硼砂(B4Na2O7・10H2O)又は酸化ホウ素(B2O3))を添加した。ホウ素量は試料中に含まれるAlに対してモル比で50%、100%を置換するように添加し、或いは、ホウ素源が原料中の10質量%又は25質量%となるように調整した。試料を温度条件25℃又は70℃にて養生し固化した。
(a)ケイ酸カリウム、水酸化カリウム、純水を混合したアルカリシリカ溶液を作製した。
(b)メタカオリン、シリカフューム(商標名:マイクロシリカ)、硼砂または酸化ホウ素を混合し、ふるいにかけた。
(c)上記(b)で混合した粉を、数回に分けて(a)のアルカリシリカ溶液に入れ、混合した。このとき発熱を伴うため、氷水で混合物を冷却しながら混合した。
(d)混合したものを円筒形の型(φ38.0×61.5mm)に30ml流し込み、所定の温度(25℃又は70℃)で養生し、固化させた。
(e)水分が抜けていくため、時間の経過と共に質量が減少した。質量変化が落ち着いたところで測定を行った。
調製した試料について、嵩密度の測定、XRD(X線回折)、溶解試料のICP−AES(誘導結合プラズマ発光分光)分析を行った。嵩密度については固化後随時、XRDと溶解試料のICP−AES分析については、固化後十分に時間が経過し質量が一定となってから測定を行った。
固化した試料の直径及び高さと質量より嵩密度を算出した。
固化した試料を乳鉢ですり潰し、紛体を測定し、析出物の有無を調べた。
70℃で養生を行った試料について、原材料の仕込み量をもとに、最終的に水分量が試料全体の5質量%まで減少するのもとして、含有するホウ素量の算出を行った。そして、一部の試料について、酸とマイクロ波加熱により溶解してICP−AES分析でホウ素量の測定を行った。その結果を表2に示す。
モンテカルロ計算コードPHITS(T. Sato, et al., Particle and Heavy Ion Transport Code System PHITS, Version 2.52, J. Nucl. Sci. Technol. 50:9, 913-923 (2013))を用いて、アルミニウムがホウ素で置換された本発明のジオポリマーの中性子線遮蔽能力の検証を行った。なお、保守的に計算を行うため、ジオポリマーの組成は、水分の蒸発による相対的なホウ素量の増加は考慮せず、原材料の仕込み量から推定したものを用いた。一方、密度は固化、脱水後に測定した嵩密度を用いた。その結果を図3に示す。
上記のモンテカルロ計算コードPHITSを用いて、エネルギー662keVのガンマ線(Cs−137の放射線に相当)遮蔽能力の検証を行った。ジオポリマーの組成、密度の条件は、中性子線遮蔽能力の検証時と同様とした。また、比較のため、水についても検証を行った。その結果を図4に示す。
Claims (6)
- アルミノケイ酸塩からなる非晶質のジオポリマーのアルミニウムがホウ素に置換された構造を有することを特徴とする放射線遮蔽体。
- ホウ素の含有量が、0.5〜10質量%であることを特徴とする請求項1記載の放射線遮蔽体。
- 略球形に成形されたものであることを特徴とする請求項1又は2記載の放射線遮蔽体。
- 多孔質であることを特徴とする請求項1〜3のいずれかに記載の放射線遮蔽体。
- シート状に成形されたものであることを特徴とする請求項1又は2記載の放射線遮蔽体。
- 粉末状であることを特徴とする請求項1又は2記載の放射線遮蔽体。
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JP2016035701A JP6664639B2 (ja) | 2016-02-26 | 2016-02-26 | 放射線遮蔽体 |
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JP2016035701A JP6664639B2 (ja) | 2016-02-26 | 2016-02-26 | 放射線遮蔽体 |
Publications (2)
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JP2017151025A JP2017151025A (ja) | 2017-08-31 |
JP6664639B2 true JP6664639B2 (ja) | 2020-03-13 |
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Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8819260D0 (en) * | 1988-08-12 | 1988-09-14 | Exxon Chemical Patents Inc | Zeolite l preparation |
EP1971562B1 (en) * | 2005-12-06 | 2015-03-18 | James Hardie Technology Limited | Method of manufacture of shaped geopolymeric particles |
US20100258751A1 (en) * | 2007-06-20 | 2010-10-14 | Colorado Seminary, Which Owns And Operates The University Of Denver | Borated Concrete-Rubber |
FR2922543B1 (fr) * | 2007-10-18 | 2011-10-14 | Commissariat Energie Atomique | Procede de preparation d'un geopolymere a porosite controlee, le geopolymere ainsi obtenu et ses differentes applications |
JP2014125375A (ja) * | 2012-12-26 | 2014-07-07 | Nippon Concrete Ind Co Ltd | ジオポリマ硬化体およびその製造方法 |
US20140225039A1 (en) * | 2013-02-11 | 2014-08-14 | Industrial Technology Research Institute | Radiation shielding composite material including radiation absorbing material and method for preparing the same |
JP2015081872A (ja) * | 2013-10-24 | 2015-04-27 | 国立大学法人 名古屋工業大学 | 放射能遮蔽材料およびそれを用いた放射能遮蔽版の製造方法 |
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