JP5227160B2 - Radiation shielding structure - Google Patents

Radiation shielding structure Download PDF

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JP5227160B2
JP5227160B2 JP2008330157A JP2008330157A JP5227160B2 JP 5227160 B2 JP5227160 B2 JP 5227160B2 JP 2008330157 A JP2008330157 A JP 2008330157A JP 2008330157 A JP2008330157 A JP 2008330157A JP 5227160 B2 JP5227160 B2 JP 5227160B2
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shielding member
wall
radiation
ceiling
shielding
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JP2010151617A (en
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章夫 安納
堅治 萩尾
克浩 大竹
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Taisei Corp
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Description

本発明は、放射線利用施設における放射線投影面の放射線遮蔽構造に関する。   The present invention relates to a radiation shielding structure for a radiation projection surface in a radiation utilization facility.

放射線利用施設の照射室では、放射線源から放射線投影面に照射される放射線を遮蔽するため、壁や天井の照射面に鋼材などの遮蔽部材を埋設するようになっていた(例えば、特許文献1参照)。
特開平2−173600号公報
In an irradiation room of a radiation utilization facility, a shielding member such as a steel material is embedded in an irradiation surface of a wall or a ceiling in order to shield radiation irradiated on a radiation projection surface from a radiation source (for example, Patent Document 1). reference).
JP-A-2-173600

図6に示すように、従来の遮蔽構造51では、建屋躯体となる鉄筋コンクリート造躯体54の室内側または内部に、鋼や鉛などの金属等からなる遮蔽性の高い部材(以下、「遮蔽部材52」と称する)を設置し、この遮蔽部材52を支持するため、鉄筋コンクリート造躯体53を遮蔽部材52の室内側の面に別途設ける必要があった。このような遮蔽構造51では、建屋躯体の他に、前述の遮蔽部材52支持のための余分な鉄筋コンクリート造躯体53が必要となり、不経済であった。   As shown in FIG. 6, in the conventional shielding structure 51, a highly shielding member made of a metal such as steel or lead (hereinafter referred to as “shielding member 52”) is provided on the indoor side or inside of the reinforced concrete structure 54 serving as a building frame. In order to support the shielding member 52, it is necessary to separately provide a reinforced concrete structure 53 on the indoor side surface of the shielding member 52. In such a shielding structure 51, an extra reinforced concrete structure 53 for supporting the shielding member 52 described above is required in addition to the building structure, which is uneconomical.

そこで、本発明は前記の問題を解決すべく案出されたものであって、遮蔽構造構築に要するコスト低減を達成できる放射線遮蔽構造の提供を課題とする。   Therefore, the present invention has been devised to solve the above problems, and an object thereof is to provide a radiation shielding structure that can achieve cost reduction required for constructing the shielding structure.

前記課題を解決するため、本発明は、放射線源となる高エネルギーリニアックを収容する照射室の放射線遮蔽構造において、前記高エネルギーリニアックは、回転可能なガントリー部と、その回転中心に向かって全角度から放射線を照射可能な照射部とを備えており、前記放射線遮蔽構造は、壁構造躯体と天井構造躯体とを構造的に一体形成してなる門型の鉄筋コンクリート造構造躯体を備え、前記壁構造躯体の室内側の前記高エネルギーリニアックの側方の両側で放射線の照射方向に位置する壁には、放射線を遮蔽する壁遮蔽部材が立設され、前記壁遮蔽部材は、前記照射部から壁に向かって横向きに照射される放射線の先端部を覆うことができる水平長さに形成されており、前記壁遮蔽部材の下端が床面より下側に位置されるとともに、上端が天井面と略同等の高さに位置され、前記壁遮蔽部材の上端部には、室内側に突出する突出部が壁遮蔽部材の水平長さ方向の全長に亘って形成され、前記天井構造躯体の上には、放射線を遮蔽する天井遮蔽部材が前記壁遮蔽部材と分離し、互いに対向する壁遮蔽部材間の空間の上部を覆うように敷設され、前記天井遮蔽部材は、長方形形状を呈しており、一辺部が前記壁遮蔽部材の水平方向長さと同じ長さであり、前記壁遮蔽部材と前記天井遮蔽部材は、鉄板、鉛製のプレート、ポリエチレン製のプレートまたはボロン含有材のプレートのいずれかにて構成されており、前記突出部は、前記放射線源となる高エネルギーリニアックから直線的に放射される放射線が前記天井遮蔽部材、前記壁遮蔽部材または前記突出部のいずれかに当たって遮蔽されるように、鉛直方向に断面視して、突出部の室内側先端部の上端部と前記照射部とを結んだ直線の延長線が前記天井遮蔽部材に交差するように形成されていることを特徴とする放射線遮蔽構造である。 In order to solve the above-described problems, the present invention provides a radiation shielding structure for an irradiation chamber that accommodates a high-energy linac serving as a radiation source. The high-energy linac includes a rotatable gantry section and a full angle toward its rotation center. The radiation shielding structure includes a portal-type reinforced concrete structural frame formed by integrally forming a wall structural frame and a ceiling structural frame, and the wall structure. A wall shielding member for shielding radiation is erected on the walls located in the radiation direction on both sides of the high energy linac on the indoor side of the housing, and the wall shielding member is placed on the wall from the irradiation unit. It is formed in a horizontal length that can cover the tip of the radiation irradiated sideways toward the side, and the lower end of the wall shielding member is positioned below the floor surface, End is positioned in the ceiling surface substantially equal in height, the upper end portion of said wall shield member, the protruding portion protruding interior side is formed over the entire length of the horizontal longitudinal direction of the wall shielding member, said ceiling On the structural housing, a ceiling shielding member that shields radiation is separated from the wall shielding member, and is laid so as to cover an upper portion of a space between the wall shielding members facing each other , and the ceiling shielding member has a rectangular shape. One side is the same length as the horizontal length of the wall shielding member, and the wall shielding member and the ceiling shielding member are an iron plate, a lead plate, a polyethylene plate, or a boron-containing material plate. is configured in either the protrusion radiation said ceiling shielding member which is linearly emitted from the high energy linac to be the radiation source, impinging on one of said wall shield member or the protruding part As shielded, in cross section in the vertical direction, the extension line of the straight line is formed so as to intersect the roof shielding member connecting said irradiation portion and the upper portion of the indoor-side tip portion of the protruding portion This is a radiation shielding structure.

このように、壁遮蔽部材と天井遮蔽部材を分離して、天井遮蔽部材を天井構造躯体の上に載せれば、天井遮蔽部材を天井構造躯体で支持することができるので、遮蔽部材支持用の余分な鉄筋コンクリート造躯体が不要になる。したがって、遮蔽構造構築に要する材料、施工コストを削減できる。また、壁構造躯体と天井構造躯体とを構造的に一体形成しているので、これらを同時に施工することができ、施工手間の軽減が図れ、施工性の向上を達成できる。また、突出部の先端部と照射部とを結んだ直線の延長線が天井遮蔽部材に交差するように突出部を形成したことによって、照射部から直線的に放射される放射線が天井遮蔽部材、壁遮蔽部材または突出部のいずれかで遮蔽されるようになり、天井遮蔽部材と壁遮蔽部材との離間距離が大きい場合でも、放射線を確実に遮蔽することができる。 Thus, if the wall shielding member and the ceiling shielding member are separated and the ceiling shielding member is placed on the ceiling structure housing, the ceiling shielding member can be supported by the ceiling structure housing. No extra reinforced concrete structures are required. Therefore, the material and construction cost required for the construction of the shielding structure can be reduced. Moreover, since the wall structure casing and the ceiling structure casing are structurally integrated, they can be applied at the same time, so that the construction labor can be reduced and the workability can be improved. Further, by forming the projecting portion so that the straight extension line connecting the tip portion of the projecting portion and the irradiation portion intersects the ceiling shielding member, the radiation radiated linearly from the irradiation portion is the ceiling shielding member, come to be shielded by any of the wall shielding member or protrusion, even if the distance between the ceiling shield member and the wall shielding member is large, it is possible to reliably shield radiation.

また、本発明は、放射線源となる高エネルギーリニアックを収容する照射室の放射線遮蔽構造において、前記高エネルギーリニアックは、回転可能なガントリー部と、その回転中心に向かって全角度から放射線を照射可能な照射部とを備えており、前記放射線遮蔽構造は、壁構造躯体と天井構造躯体とを構造的に一体形成してなる門型の鉄筋コンクリート造構造躯体を備え、前記壁構造躯体の室内側の前記高エネルギーリニアックの側方の両側で放射線の照射方向に位置する壁には、放射線を遮蔽する壁遮蔽部材が立設され、前記壁遮蔽部材は、前記照射部から壁に向かって横向きに照射される放射線の先端部を覆うことができる水平長さに形成されており、前記壁遮蔽部材の下端が床面より下側に位置されるとともに、上端が天井面と略同等の高さに位置され、前記天井構造躯体の上には、放射線を遮蔽する天井遮蔽部材が前記壁遮蔽部材と分離し、互いに対向する壁遮蔽部材間の空間の上部を覆うように敷設され、前記天井遮蔽部材は、長方形形状を呈しており、一辺部が前記壁遮蔽部材の水平方向長さと同じ長さであり、前記壁構造躯体側となる前記天井遮蔽部材の端部には、前記壁遮蔽部材の外側表面よりも外方に延出する延出部が形成され、前記壁遮蔽部材と前記天井遮蔽部材は、鉄板、鉛製のプレート、ポリエチレン製のプレートまたはボロン含有材のプレートのいずれかにて構成されており、前記延出部は、前記放射線源となる高エネルギーリニアックから直線的に放射される放射線が前記天井遮蔽部材、前記壁遮蔽部材または前記延出部のいずれかに当たって遮蔽されるように、鉛直方向に断面視して、当該延出部が位置する側の前記壁遮蔽部材の室内側の上端部と前記照射部とを結んだ直線の延長線が前記延出部に交差するように形成されていることを特徴とする放射線遮蔽構造である。 Further, the present invention provides a radiation shielding structure for an irradiation chamber that accommodates a high energy linac serving as a radiation source. The high energy linac can irradiate radiation from all angles toward a rotatable gantry section and its rotation center. The radiation shielding structure includes a portal-type reinforced concrete structural frame formed by structurally integrally forming a wall structural frame and a ceiling structural frame, and is provided on the indoor side of the wall structural frame. A wall shielding member that shields radiation is erected on the walls positioned in the radiation irradiation direction on both sides of the high energy linac, and the wall shielding member irradiates laterally from the irradiation unit toward the wall. The lower end of the wall shielding member is positioned below the floor surface, and the upper end is substantially the same as the ceiling surface. Is the position of the height, on the ceiling structural framework is ceiling shielding member for shielding radiation is separated from the wall shielding member, is laid so as to cover the upper part of the space between the wall shielding member facing each other, The ceiling shielding member has a rectangular shape, one side of which is the same length as the horizontal length of the wall shielding member, and the end of the ceiling shielding member on the wall structure housing side has the wall An extending portion extending outward from the outer surface of the shielding member is formed, and the wall shielding member and the ceiling shielding member are any of an iron plate, a lead plate, a polyethylene plate, or a boron-containing material plate. is constituted by one, the extending portion is shielded radiation is linearly emitted from the high energy linac serving as the radiation source is the ceiling shielding member, when any one of said wall shield member or the extending portion As, in cross section in the vertical direction, crossing the extension line of the line connecting the indoor side of the upper portion of the wall shielding member on the side where the extended portion is positioned between the said irradiation portion in the extending portion it is formed so as to be radiation-shielding structure according to claim.

このように、壁遮蔽部材と天井遮蔽部材を分離して、天井遮蔽部材を天井構造躯体の上に載せれば、天井遮蔽部材を天井構造躯体で支持することができるので、遮蔽部材支持用の余分な鉄筋コンクリート造躯体が不要になる。したがって、遮蔽構造構築に要する材料、施工コストを削減できる。また、壁構造躯体と天井構造躯体とを構造的に一体形成しているので、これらを同時に施工することができ、施工手間の軽減が図れ、施工性の向上を達成できる。また、壁遮蔽部材の上端部と照射部とを結んだ直線の延長線が延出部に交差するように延出部を形成したことによって、照射部から直線的に放射される放射線が天井遮蔽部材、壁遮蔽部材または延出部のいずれかで遮蔽されるようになり、天井遮蔽部材と壁遮蔽部材との離間距離が大きい場合でも、放射線を確実に遮蔽することができる。 Thus, if the wall shielding member and the ceiling shielding member are separated and the ceiling shielding member is placed on the ceiling structure housing, the ceiling shielding member can be supported by the ceiling structure housing. No extra reinforced concrete structures are required. Therefore, the material and construction cost required for the construction of the shielding structure can be reduced. Moreover, since the wall structure casing and the ceiling structure casing are structurally integrated, they can be applied at the same time, so that the construction labor can be reduced and the workability can be improved. In addition, since the extended portion is formed so that the straight extension line connecting the upper end portion of the wall shielding member and the irradiated portion intersects the extended portion , the radiation radiated linearly from the irradiated portion is shielded from the ceiling. member, will be shielded by any of the wall shielding member or the extending portion, even if the distance between the ceiling shield member and the wall shielding member is large, it is possible to reliably shield radiation.

また、本発明は、前記壁遮蔽部材の室内側にコンクリートにて形成され放射線の反射を防止する壁放射線反射防止層をさらに備えたものが好ましい。このような構成によれば、壁遮蔽部材が露出しないので、放射線の反射を防止できる。また、壁放射線反射防止層をコンクリートにて形成する場合でも、構造体とする必要はないので、配筋量の増加を抑えることができる。   In the present invention, it is preferable that the wall shielding member further includes a wall radiation antireflection layer that is made of concrete and prevents reflection of radiation. According to such a configuration, since the wall shielding member is not exposed, reflection of radiation can be prevented. Further, even when the wall radiation antireflection layer is formed of concrete, it is not necessary to use a structure, so that an increase in the amount of reinforcement can be suppressed.

さらに、本発明は、前記天井遮蔽部材の上側に形成される天井打増しコンクリート層をさらに備えたものが好ましい。天井打増しコンクリート層は、上階に一般室がある場合や屋上設備がある場合に形成されるものである。このような構成によれば、天井遮蔽部材が露出しないので、放射線の散乱を低減できる。また、天井打増しコンクリートは、構造体とする必要はないので、配筋量の増加を抑えることができる。   Furthermore, it is preferable that the present invention further includes a ceiling reinforced concrete layer formed on the upper side of the ceiling shielding member. The concrete layer added to the ceiling is formed when there is a general room on the upper floor or when there is a rooftop facility. According to such a configuration, since the ceiling shielding member is not exposed, radiation scattering can be reduced. Moreover, since it is not necessary to make the ceiling-reinforced concrete into a structure, an increase in the amount of reinforcement can be suppressed.

本発明によれば、遮蔽部材支持用の余分な鉄筋コンクリート造躯体を不要にすることができるので、遮蔽構造構築に要する材料、施工コストを削減できるといった優れた効果を発揮する。   According to the present invention, since an extra reinforced concrete structure for supporting the shielding member can be eliminated, an excellent effect of reducing the material and construction cost required for constructing the shielding structure is exhibited.

本発明を実施するための最良の第一の形態について、添付図面を参照しながら詳細に説明する。なお、本実施形態では、放射線源として高エネルギーリニアック(放射線治療器)3を収容する照射室2に形成される放射線遮蔽構造1を例に挙げて、その構成を説明する。   BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, the configuration of the radiation shielding structure 1 formed in the irradiation chamber 2 that houses a high energy linac (radiotherapy device) 3 as a radiation source will be described as an example.

図1乃至図3に示すように、高エネルギーリニアック3は、放射線発生装置4と治療台5とで構成されており、放射線発生装置4は、回転可能なガントリー部4aを備えており、ガントリー部4aに設けられた照射部Pから患者の患部に向けて放射線を照射する。照射部Pは、ガントリー部4aの回転中心Gに対向するように設けられている。照射部Pは、ガントリー部4aが回転することで、回転中心Gを中心とする移動軌跡L上を360度回転可能になっている。これによって、照射部Pは、回転中心Gに向かって全角度から放射線を照射できる。   As shown in FIGS. 1 to 3, the high energy linac 3 includes a radiation generating device 4 and a treatment table 5, and the radiation generating device 4 includes a rotatable gantry unit 4 a. Radiation is irradiated from the irradiation part P provided in 4a toward the affected part of the patient. The irradiation part P is provided so as to face the rotation center G of the gantry part 4a. The irradiation part P can be rotated 360 degrees on the movement locus L around the rotation center G as the gantry part 4a rotates. Thereby, the irradiation part P can irradiate the radiation from all angles toward the rotation center G.

本発明に係る放射線遮蔽構造1は、放射線源である高エネルギーリニアック3を収容する照射室の内外を区画する構造であって、鉄筋コンクリート造の壁構造躯体10の室内側に立設され放射線を遮蔽する壁遮蔽部材20と、壁構造躯体10の上部に構造的に一体形成された鉄筋コンクリート造の天井構造躯体30の上に敷設され放射線を遮蔽する天井遮蔽部材40と、を備えたことを特徴とする。すなわち、壁構造躯体10と天井構造躯体30とで一体に構成された門型の構造体部を形成し、その内側に壁遮蔽部材20を設け、その上に天井遮蔽部材40を壁遮蔽部材20と分離して設けた構成となっている。さらに、壁遮蔽部材20の室内側に壁放射線反射防止層50が形成され、天井遮蔽部材40の上側に天井打増しコンクリート層60が形成されている。   A radiation shielding structure 1 according to the present invention is a structure that divides the inside and outside of an irradiation chamber that houses a high-energy linac 3 that is a radiation source, and is erected on the indoor side of a reinforced concrete wall structure housing 10 to shield radiation. And a ceiling shielding member 40 that is laid on a reinforced concrete ceiling structure housing 30 that is structurally integrally formed on an upper portion of the wall structure housing 10 and shields radiation. To do. That is, a gate-shaped structure part integrally formed by the wall structure case 10 and the ceiling structure case 30 is formed, the wall shielding member 20 is provided on the inner side, and the ceiling shielding member 40 is provided on the wall shielding member 20. It is the structure provided separately. Further, a wall radiation reflection preventing layer 50 is formed on the indoor side of the wall shielding member 20, and a concrete layer 60 is formed on the ceiling above the ceiling shielding member 40 by increasing the ceiling.

壁構造躯体10は、図1に示すように、壁横筋11と壁縦筋12がそれぞれ所定のピッチで配筋され、これらを覆うようにコンクリート13が所定厚さで打設されて形成されている。壁縦筋12は、その下端が地中梁70(照射室2が二階以上にある場合は下階の梁)内に挿入され、上端が上部の梁71に挿入されている。なお、図示しないが、地中梁70および梁71には、上端筋、下端筋やフープ筋等の鉄筋が配筋されている。壁構造躯体10の厚さは、放射線源から照射される放射線の強さと、壁遮蔽部材20の厚さおよび材質に応じて、適宜設定される。なお、放射線遮蔽性能から決まるコンクリート厚さは、構造的要求から決まるコンクリート厚さより十分に厚い。壁構造躯体10は、壁の厚さ方向に見て室外側に配置されており、壁遮蔽部材20が室内側に配置されるようになっている。   As shown in FIG. 1, the wall structure frame 10 is formed by placing the horizontal wall bars 11 and the vertical wall bars 12 at a predetermined pitch, and concrete 13 is placed at a predetermined thickness so as to cover them. Yes. The lower end of the vertical wall 12 is inserted into the underground beam 70 (the lower beam when the irradiation chamber 2 is on the second floor or higher), and the upper end is inserted into the upper beam 71. Although not shown, the underground beam 70 and the beam 71 are provided with reinforcing bars such as upper end bars, lower end bars and hoop bars. The thickness of the wall structure 10 is appropriately set according to the intensity of radiation irradiated from the radiation source and the thickness and material of the wall shielding member 20. The concrete thickness determined from the radiation shielding performance is sufficiently thicker than the concrete thickness determined from structural requirements. The wall structure housing 10 is arranged on the outdoor side when viewed in the thickness direction of the wall, and the wall shielding member 20 is arranged on the indoor side.

壁遮蔽部材20は、図1および図2に示すように、高エネルギーリニアック3の側方の両側で、放射線の照射方向に位置する壁(放射線投影面)に配置されている。壁遮蔽部材20は、高エネルギーリニアック3の照射部Pから壁に向かって横向きに照射される放射線の照射方向先端部を覆うことができる水平長さに形成されている。壁遮蔽部材20は、鉄板を所定の厚さに積層して構成されているが、材質および形状はこれに限られるものではない。例えば、放射線の種類に応じて、ガンマ線遮蔽に有効な鉛製のプレートを用いたり、中性子遮蔽に有効なポリエチレン製、或いはボロン含有材のプレート等を用いたりしてもよい。遮蔽性の高い材質を用いると壁遮蔽部材20を薄く形成することができる。壁遮蔽部材20の厚さは、放射線源から照射される放射線の強さと、壁遮蔽部材20の材質に応じて、適宜設定される。   As shown in FIGS. 1 and 2, the wall shielding member 20 is disposed on a wall (radiation projection plane) positioned in the radiation irradiation direction on both sides of the high energy linac 3. The wall shielding member 20 is formed in a horizontal length that can cover the front end of the irradiation direction of the radiation irradiated laterally from the irradiation part P of the high energy linac 3 toward the wall. The wall shielding member 20 is configured by laminating iron plates with a predetermined thickness, but the material and shape are not limited thereto. For example, depending on the type of radiation, a lead plate effective for gamma ray shielding, a polyethylene plate effective for neutron shielding, or a boron-containing material plate may be used. If a material having high shielding properties is used, the wall shielding member 20 can be formed thin. The thickness of the wall shielding member 20 is appropriately set according to the intensity of radiation irradiated from the radiation source and the material of the wall shielding member 20.

壁遮蔽部材20は、必要に応じて建屋の床構造躯体、壁構造躯体10、天井構造躯体30にアンカーで固定したり、下部を床構造躯体に落としこんだりして転倒を防止するようにしてもよい。また、壁遮蔽部材20は、コンクリートに埋設することで、壁遮蔽部材20と一体的に仕上げてもよい。   The wall shielding member 20 is fixed to the floor structure housing 10 of the building, the wall structure housing 10 and the ceiling structure housing 30 with an anchor as needed, or the lower part is dropped into the floor structure housing to prevent the fall. Also good. Moreover, you may finish the wall shielding member 20 integrally with the wall shielding member 20 by being embed | buried in concrete.

壁遮蔽部材20は、図1に示すように、下端が床面より下側に位置され、上端が天井面と略同等の高さに位置されている。壁遮蔽部材20の上端部には、照射室2の室内側に突出する突出部21が形成されている。突出部21は、壁遮蔽部材20の長さ方向(図1の紙面表裏方向)の全長に亘って形成されている。突出部21は、所定厚さの鉄板を積層して構成されており、平板状の鉄板の上端に接合されている。なお、突出部21の材質は、スチールに限定されるものではなく、例えば、放射線の種類に応じて、ガンマ線遮蔽に有効な鉛を用いたり、中性子遮蔽に有効なポリエチレン製、或いはボロン含有材等を用いたりしてもよい。また、突出部21は、平板状の壁遮蔽部材20と一体で形成してもよい。突出部21は、その室内側先端の上端部と照射部Pとを結んだ直線の延長線(図1中、一点鎖線にて示す)が後述する天井遮蔽部材40に交差するように、突出寸法が設定されている。これによって、照射部Pから壁方向または天井方向に照射された放射線は必ず壁遮蔽部材20、突出部21または天井遮蔽部材40のいずれかに当ることとなり、確実に遮蔽される。特に、壁遮蔽部材20と天井遮蔽部材40の隙間部分においても、放射線は、図1中、一点鎖線にて示すように、天井遮蔽部材40に当って、外部に漏れることはない。   As shown in FIG. 1, the wall shielding member 20 has a lower end located below the floor surface and an upper end located at substantially the same height as the ceiling surface. At the upper end portion of the wall shielding member 20, a protruding portion 21 that protrudes toward the indoor side of the irradiation chamber 2 is formed. The protrusion 21 is formed over the entire length of the wall shielding member 20 in the length direction (the front and back direction in FIG. 1). The protruding portion 21 is configured by stacking iron plates having a predetermined thickness, and is joined to the upper end of a flat iron plate. In addition, the material of the protrusion part 21 is not limited to steel, For example, according to the kind of radiation, the lead effective in gamma ray shielding, the polyethylene made effective in neutron shielding, or the boron containing material etc. May be used. Further, the protruding portion 21 may be formed integrally with the flat wall shielding member 20. The protruding portion 21 has a protruding dimension such that a linear extension line (indicated by a one-dot chain line in FIG. 1) connecting the upper end of the indoor-side tip and the irradiation portion P intersects a ceiling shielding member 40 described later. Is set. Thereby, the radiation irradiated from the irradiation part P in the wall direction or the ceiling direction always hits any one of the wall shielding member 20, the projecting part 21, and the ceiling shielding member 40 and is reliably shielded. In particular, also in the gap portion between the wall shielding member 20 and the ceiling shielding member 40, the radiation does not leak to the outside by hitting the ceiling shielding member 40 as shown by a one-dot chain line in FIG.

天井構造躯体30は、図1に示すように、それぞれ格子状に配置された上端筋31と下端筋32が所定のピッチで配置され、これらを覆うようにコンクリート33が所定厚さで打設されて形成されている。上端筋31と下端筋32は、その端部が上部の梁71に挿入されている。天井構造躯体30の厚さは、放射線源から照射される放射線の強さと、天井遮蔽部材40の厚さおよび材質に応じて、適宜設定される。天井構造躯体30は、壁構造躯体10の上部に構造的に一体形成されており、壁構造躯体10の構築後にコンクリートが打設されて形成されている。天井構造躯体30は、壁遮蔽部材20の上端を覆うように形成されている。   As shown in FIG. 1, the ceiling structural body 30 has upper end bars 31 and lower end bars 32 arranged in a grid pattern at a predetermined pitch, and concrete 33 is placed with a predetermined thickness so as to cover them. Is formed. The upper end 31 and the lower end 32 are inserted into the upper beam 71 at their ends. The thickness of the ceiling structural body 30 is appropriately set according to the intensity of radiation irradiated from the radiation source and the thickness and material of the ceiling shielding member 40. The ceiling structural body 30 is structurally integrally formed on the upper part of the wall structural body 10 and is formed by placing concrete after the construction of the wall structural body 10. The ceiling structural housing 30 is formed so as to cover the upper end of the wall shielding member 20.

このような構成によって、壁構造躯体10と天井構造躯体30が一体化されて断面門型を呈し、その内側に、一対の壁遮蔽部材20が所定の間隔を隔てて互いに対向するように配置されることとなる。   With such a configuration, the wall structure housing 10 and the ceiling structure housing 30 are integrated to form a cross-sectional gate shape, and a pair of wall shielding members 20 are disposed inside the wall structure member 20 so as to face each other at a predetermined interval. The Rukoto.

天井遮蔽部材40は、互いに対向する壁遮蔽部材20,20間の空間の上部を覆うように、天井構造躯体30上に敷設されており、壁遮蔽部材20に対して、所定の間隔を空けて上方に配置されるようになっている。天井遮蔽部材40は、天井の放射線投影面を覆うように配置されている。天井遮蔽部材40は、天井構造躯体30にアンカー(図示せず)で固定されている。なお、天井遮蔽部材40は、天井構造躯体30に落とし込んで天井構造躯体30に固定するようにしてもよい。なお、天井遮蔽部材30はコンクリートに埋設して仕上げてもよい。   The ceiling shielding member 40 is laid on the ceiling structure housing 30 so as to cover the upper part of the space between the wall shielding members 20 and 20 facing each other, and is spaced from the wall shielding member 20 by a predetermined interval. It is arranged above. The ceiling shielding member 40 is disposed so as to cover the radiation projection surface of the ceiling. The ceiling shielding member 40 is fixed to the ceiling structure housing 30 with an anchor (not shown). The ceiling shielding member 40 may be dropped into the ceiling structure housing 30 and fixed to the ceiling structure housing 30. The ceiling shielding member 30 may be finished by being embedded in concrete.

天井遮蔽部材40は、所定厚さの長方形状を呈しており、鉄板を所定の厚さに積層して構成されている。なお、天井遮蔽部材40の材質および形状はこれに限られるものではない。例えば、例えば、放射線の種類に応じて、ガンマ線遮蔽に有効な鉛を用いたり、中性子遮蔽に有効なポリエチレン製、或いはボロン含有材等を用いたりしてもよい。天井遮蔽部材40の厚さは、放射線源から照射される放射線の強さと、天井遮蔽部材40の材質に応じて、適宜設定される。天井遮蔽部材40は、短辺部が壁遮蔽部材20の水平方向長さと同じ長さあって、平面視して、短辺部が下方の壁遮蔽部材20の外側表面と重なる大きさとなっている。また、天井遮蔽部材40は、その長辺部が隣り合う梁71,71の離間距離より短く、これら梁71,71の間に配置可能となっている。なお、壁遮蔽部材20の突出部21の突出寸法を長くすれば、天井遮蔽部材40の長辺部の長さを短くすることが可能となる。   The ceiling shielding member 40 has a rectangular shape with a predetermined thickness, and is configured by stacking iron plates to a predetermined thickness. The material and shape of the ceiling shielding member 40 are not limited to this. For example, lead effective for gamma ray shielding, polyethylene made of neutron shielding, or a boron-containing material may be used depending on the type of radiation. The thickness of the ceiling shielding member 40 is appropriately set according to the intensity of radiation irradiated from the radiation source and the material of the ceiling shielding member 40. The ceiling shielding member 40 has a short side portion that is the same length as the horizontal length of the wall shielding member 20, and has a size in which the short side portion overlaps the outer surface of the lower wall shielding member 20 in plan view. . Further, the ceiling shielding member 40 has a long side portion shorter than the separation distance between the adjacent beams 71 and 71, and can be disposed between the beams 71 and 71. In addition, if the protrusion dimension of the protrusion part 21 of the wall shielding member 20 is lengthened, the length of the long side part of the ceiling shielding member 40 can be shortened.

壁放射線反射防止層50は、壁遮蔽部材20の室内側にコンクリートにて形成されている。壁放射線反射防止層50は、放射線が壁遮蔽部材20で室内へ反射するのを防止するために設けられている。壁放射線反射防止層50は、コンクリートを100mm〜1000mm程度の厚さで打増しして形成された打増しコンクリートにて構成されている。壁放射線反射防止層50には、コンクリートの割れや剥離を防止するための鉄筋またはメッシュシート(図示せず)が設けられている。なお、剥離防止用の鉄筋は、構造用として配筋されていないので、配筋量が少なくて済む。壁放射線反射防止層50は、壁構造躯体10と同時打設施工してもよいし、壁構造躯体10の構築後に後打ち施工してもよい。   The wall radiation reflection preventing layer 50 is formed of concrete on the indoor side of the wall shielding member 20. The wall radiation reflection preventing layer 50 is provided to prevent radiation from being reflected indoors by the wall shielding member 20. The wall radiation reflection preventing layer 50 is made of reinforced concrete formed by blasting concrete with a thickness of about 100 mm to 1000 mm. The wall radiation reflection preventing layer 50 is provided with a reinforcing bar or a mesh sheet (not shown) for preventing cracking and peeling of concrete. Since the reinforcing bars for preventing peeling are not arranged for the structure, the amount of arrangement is small. The wall radiation antireflection layer 50 may be installed at the same time as the wall structure 10 or may be post-installed after the construction of the wall structure 10.

なお、壁放射線反射防止層50は、通常のコンクリートではなく、低放射化コンクリートを用いてもよい。低放射化コンクリートを用いれば、コンクリートが中性子線を浴びたときに起こるコンクリートの放射化を低減することができるので好ましい。低放射化コンクリートを採用する場合は、壁放射線反射防止層50は、壁構造躯体10の構築後に後打ち施工される。   The wall radiation reflection preventing layer 50 may be made of low activation concrete instead of normal concrete. Use of low activation concrete is preferable because it can reduce the activation of the concrete that occurs when the concrete is exposed to neutron radiation. When low activation concrete is employed, the wall radiation antireflection layer 50 is post-installed after the construction of the wall structure 10.

天井打増しコンクリート層60は、天井遮蔽部材40の上面が露出するのを防止するために設けられている。天井打増しコンクリート層60は、特に上階に一般室がある場合に形成されるものである。天井打増しコンクリート層60は、コンクリートを100mm〜1000mm程度の厚さで打増しして形成されている。天井打増しコンクリート層60には、コンクリートの割れや剥離を防止するための鉄筋またはメッシュシート(図示せず)が設けられている。なお、剥離防止用の鉄筋は、構造用として用いられてないので、配筋量が少なくて済む。天井打増しコンクリート層60は、天井構造躯体30の構築後に後打ち施工される。   The ceiling reinforced concrete layer 60 is provided to prevent the upper surface of the ceiling shielding member 40 from being exposed. The ceiling-reinforced concrete layer 60 is formed particularly when there is a general room on the upper floor. The ceiling reinforced concrete layer 60 is formed by blasting concrete with a thickness of about 100 mm to 1000 mm. Reinforced concrete layer 60 is provided with reinforcing bars or mesh sheets (not shown) for preventing cracking and peeling of concrete. In addition, since the reinforcing bars for preventing peeling are not used for structures, the amount of reinforcing bars is small. The ceiling-applied concrete layer 60 is post-casted after the construction of the ceiling structural frame 30.

以上のような構成の放射線遮蔽構造1によれば、壁遮蔽部材20と天井遮蔽部材40とが分離されて形成されているので、従来の遮蔽構造(図6参照)のように鉄板(壁遮蔽部材および天井遮蔽部材)の内外でコンクリートの構造体部が分割形成されることはない。したがって、壁遮蔽部材20の室外側の片面のみに壁構造躯体10を形成すればよく、また、天井遮蔽部材40の下側の片面のみに天井構造躯体30を形成すればよい。これによって、遮蔽部材支持用の余分な鉄筋コンクリート造躯体が不要になる。したがって、遮蔽構造構築に要する施工手間の軽減が図れるとともに、材料、施工コストを削減できる。   According to the radiation shielding structure 1 configured as described above, since the wall shielding member 20 and the ceiling shielding member 40 are formed separately, an iron plate (wall shielding) as in the conventional shielding structure (see FIG. 6). The structure part of the concrete is not divided and formed inside and outside the member and the ceiling shielding member). Therefore, the wall structure housing 10 may be formed only on one side of the wall shielding member 20 on the outdoor side, and the ceiling structure housing 30 may be formed only on the lower surface of the ceiling shielding member 40. This eliminates the need for an extra reinforced concrete structure for supporting the shielding member. Therefore, it is possible to reduce the labor required for constructing the shielding structure, and it is possible to reduce the material and the construction cost.

また、壁遮蔽部材20と天井遮蔽部材40が分離して設けられているので、その荷重を分散してバランスよく効率的に負担できる。これによって、壁構造躯体10および天井構造躯体30の配筋量およびコンクリート量をさらに低減でき、施工コストを低減できる。   Moreover, since the wall shielding member 20 and the ceiling shielding member 40 are provided separately, the load can be dispersed and efficiently borne in a balanced manner. Thereby, the amount of bar arrangement and the amount of concrete of the wall structure case 10 and the ceiling structure case 30 can be further reduced, and the construction cost can be reduced.

さらに、壁構造躯体10と天井構造躯体30とを構造的に一体形成しているので、これらを同時に施工することができ、施工手間の軽減が図れ、施工性の向上を達成できる。   Furthermore, since the wall structure housing 10 and the ceiling structure housing 30 are structurally integrally formed, they can be constructed at the same time, the construction labor can be reduced, and the workability can be improved.

また、本実施形態では、壁遮蔽部材20の室内側に壁放射線反射防止層50を設けたことによって、壁遮蔽部材20が露出しないので、放射線の室内側への反射を防止できる。また、壁放射線反射防止層50をコンクリートにて形成する場合でも、コンクリートの割れや剥離を防止できる程度の鉄筋またはメッシュシートを設ければよく、壁放射線反射防止層50を構造体とする必要はないので、配筋量の増加を抑えることができる。   In the present embodiment, the wall radiation reflection preventing layer 50 is provided on the indoor side of the wall shielding member 20 so that the wall shielding member 20 is not exposed, so that reflection of radiation into the indoor side can be prevented. Further, even when the wall radiation antireflection layer 50 is formed of concrete, it is only necessary to provide a reinforcing bar or a mesh sheet that can prevent cracking and peeling of the concrete, and the wall radiation antireflection layer 50 needs to be a structure. Since there is not, the increase in the amount of bar arrangement can be suppressed.

さらに、壁放射線反射防止層50が薄くて済む場合は、遮蔽部材支持用の余分な鉄筋コンクリート造躯体が不要になるとともに、必要な室内寸法に対して、壁面から近い位置に壁遮蔽部材20を配置することができる。これによって、互いに対向する壁遮蔽部材20,20間の距離を短くすることができ、上方に配置される天井遮蔽部材40の寸法を小さくすることができるので、高エネルギーリニアック3の場合の放射線遮蔽効率がよく、コンパクト化が可能となる。したがって、天井遮蔽部材40の重量を低減でき、天井構造躯体30に作用する荷重が低減されるとともに、天井遮蔽部材40自体の製造コストも低減できる。   Furthermore, when the wall radiation antireflection layer 50 is thin, an extra reinforced concrete structure for supporting the shielding member is not necessary, and the wall shielding member 20 is disposed at a position closer to the wall surface with respect to the required indoor dimensions. can do. Accordingly, the distance between the wall shielding members 20 and 20 facing each other can be shortened, and the size of the ceiling shielding member 40 disposed above can be reduced. Therefore, the radiation shielding in the case of the high energy linac 3 is achieved. Efficient and compact. Therefore, the weight of the ceiling shielding member 40 can be reduced, the load acting on the ceiling structure housing 30 can be reduced, and the manufacturing cost of the ceiling shielding member 40 itself can be reduced.

次に、本発明を実施するための最良の第二の形態について、図4および図5を参照しながら詳細に説明する。   Next, the second best mode for carrying out the present invention will be described in detail with reference to FIGS. 4 and 5. FIG.

本実施形態に係る放射線遮蔽構造1’は、壁の室外側部分に形成される鉄筋コンクリート製の壁構造躯体15と、この壁構造躯体15の室内側に立設される壁遮蔽部材25と、壁構造躯体15の上部に構造的に一体形成された鉄筋コンクリート製の天井構造躯体35と、この天井構造躯体35上に敷設される天井遮蔽部材45と、を備えている。また、本実施形態では、壁遮蔽部材25の室内側および室外側の両方に、打増しコンクリート層55が形成されている。壁遮蔽部材25の両側の打増しコンクリート層55のうち、壁遮蔽部材25の室内側部分55aが壁放射線反射防止層の役目を果たしている。さらに、天井遮蔽部材45の上側に、天井打増しコンクリート層65が形成されている。   The radiation shielding structure 1 ′ according to this embodiment includes a wall structure housing 15 made of reinforced concrete formed on an outdoor portion of a wall, a wall shielding member 25 erected on the indoor side of the wall structure housing 15, and a wall A ceiling structure casing 35 made of reinforced concrete is integrally formed on the top of the structure casing 15, and a ceiling shielding member 45 laid on the ceiling structure casing 35. In this embodiment, the reinforced concrete layer 55 is formed on both the indoor side and the outdoor side of the wall shielding member 25. Of the reinforced concrete layer 55 on both sides of the wall shielding member 25, the indoor side portion 55a of the wall shielding member 25 serves as a wall radiation reflection preventing layer. In addition, a ceiling-stretched concrete layer 65 is formed on the upper side of the ceiling shielding member 45.

壁構造躯体15は、図4に示すように、壁横筋11と壁縦筋12がそれぞれ所定のピッチで配筋され、これらを覆うようにコンクリート13が所定厚さで打設されて形成されている。壁構造躯体15は、構造的な強度を備えるための配筋量と厚さを備えて構成されており、第一実施形態の壁構造躯体10(図1参照)よりも薄く形成されている。なお、壁構造躯体15は、柱16(図5参照)と一体で形成されている。   As shown in FIG. 4, the wall structure frame 15 is formed by placing the horizontal wall bars 11 and the vertical wall bars 12 at a predetermined pitch, and concrete 13 is placed at a predetermined thickness so as to cover them. Yes. The wall structure housing 15 is configured to have a bar arrangement amount and a thickness for providing structural strength, and is formed thinner than the wall structure housing 10 (see FIG. 1) of the first embodiment. The wall structure housing 15 is formed integrally with the pillar 16 (see FIG. 5).

壁遮蔽部材25は、鉄板を所定の厚さに積層して構成されている。なお、壁遮蔽部材25の材質および形状はこれに限られるものではない。本実施形態の壁遮蔽部材25には、第一実施形態のような突出部は形成されておらず、下端から上端にかけて平坦な表面が形成されている。壁遮蔽部材25は、壁構造躯体15の室内側表面から所定の間隔を隔てて立設されている。壁遮蔽部材25は、下端が床面より下側に位置され、上端が天井面と略同等の高さに位置されている。   The wall shielding member 25 is configured by laminating iron plates to a predetermined thickness. The material and shape of the wall shielding member 25 are not limited to this. The wall shielding member 25 of the present embodiment is not formed with a protrusion as in the first embodiment, and has a flat surface from the lower end to the upper end. The wall shielding member 25 is erected at a predetermined interval from the indoor surface of the wall structure 15. The wall shielding member 25 has a lower end positioned below the floor surface and an upper end positioned substantially at the same height as the ceiling surface.

打増しコンクリート層55は、図4および図5に示すように、壁遮蔽部材25の室内側および室外側の両方に形成されている。打増しコンクリート層55は、第一実施形態の壁放射線反射防止層50(図1参照)と同様に、通常のコンクリートで形成してもよいし、低放射化コンクリートで形成してもよい。壁放射線反射防止層の役目を果たす打増しコンクリート層55の室内側部分55aには、コンクリートの割れや剥離を防止するための鉄筋またはメッシュシート(図示せず)が設けられている。打増しコンクリート層55に設けられる鉄筋は、割れや剥離防止のためのものであって構造用ではないので、配筋量が少なくて済む。打増しコンクリート層55は、壁構造躯体15と同時打設施工してもよいし、壁構造躯体15の構築後に後打ち施工してもよい。   As shown in FIGS. 4 and 5, the reinforced concrete layer 55 is formed on both the indoor side and the outdoor side of the wall shielding member 25. The reinforced concrete layer 55 may be formed of normal concrete or low activation concrete, like the wall radiation antireflection layer 50 (see FIG. 1) of the first embodiment. Reinforcing bars or mesh sheets (not shown) for preventing cracking and peeling of the concrete are provided on the indoor side portion 55a of the reinforced concrete layer 55 serving as a wall radiation antireflection layer. Reinforcing bars provided in the reinforced concrete layer 55 are for preventing cracking and peeling and not for structure, so that the amount of reinforcing bars is small. The reinforced concrete layer 55 may be placed at the same time as the wall structure 15 or after the wall structure 15 is constructed.

一方、打増しコンクリート層55のうち、壁遮蔽部材25の室外側部分55bは、壁遮蔽部材25の室外側におけるコンクリートを厚くする役目を果たしている。すなわち、本実施形態の壁構造躯体15の厚さでは、天井構造躯体35や天井遮蔽部材45等を支持することはできるものの、放射線遮蔽性能が不足する。そこで、壁遮蔽部材25の室外側でも、壁構造躯体15との間に打増しコンクリート層55を形成することによって、室外側部分55bと壁構造躯体15とが合わさって、必要な放射線遮蔽性能を得ることができるコンクリート厚さを確保するようになっている。なお、打増しコンクリート層55の室外側部分55bは、無筋でもよい。   On the other hand, in the reinforced concrete layer 55, the outdoor portion 55 b of the wall shielding member 25 serves to thicken the concrete on the outdoor side of the wall shielding member 25. That is, the thickness of the wall structure casing 15 of the present embodiment can support the ceiling structure casing 35, the ceiling shielding member 45, etc., but the radiation shielding performance is insufficient. Therefore, by forming the concrete layer 55 between the wall structure housing 15 and the outside of the wall shielding member 25, the outdoor portion 55b and the wall structure housing 15 are combined to provide the necessary radiation shielding performance. The concrete thickness that can be obtained is secured. In addition, the outdoor part 55b of the reinforced concrete layer 55 may be unreinforced.

なお、壁遮蔽部材25が配設されていない部分では、図5に示すように、打増しコンクリート層55は、室内側部分55aと壁遮蔽部材25と室外側部分55bとを合わせた厚さと同等の厚さに形成されている。   In the portion where the wall shielding member 25 is not provided, as shown in FIG. 5, the reinforced concrete layer 55 is equivalent to the combined thickness of the indoor portion 55a, the wall shielding member 25, and the outdoor portion 55b. It is formed in the thickness.

天井構造躯体35は、図4に示すように、それぞれ格子状に配置された上端筋31と下端筋32が所定のピッチで配置され、これらを覆うようにコンクリート33が所定厚さで打設されて形成されている。天井構造躯体35は、上端が平坦に形成されている。   As shown in FIG. 4, the upper structure 31 and the lower structure 32 are arranged at a predetermined pitch in the ceiling structure body 35, and concrete 33 is placed at a predetermined thickness so as to cover them. Is formed. The ceiling structure housing 35 has a flat upper end.

天井遮蔽部材45は、天井構造躯体35上に敷設されており、壁遮蔽部材25に対して、所定の間隔を空けて上方に配置されるようになっている。天井遮蔽部材45は、所定厚さの長方形状を呈しており、鉄板を所定の厚さに積層して構成されている。天井遮蔽部材45の短辺部は、壁遮蔽部材25の水平方向長さと同じ長さである。また、天井遮蔽部材45の長辺部は、対向する壁遮蔽部材25,25の外側表面間の距離よりも長い。すなわち、天井遮蔽部材45の長手方向両端には、下方の壁遮蔽部材25の外側表面よりも外方に延出する延出部45a,45aが形成されている。延出部45aは、照射部Pと、壁遮蔽部材25の室内側上端部とを結んだ直線の延長線(図4中、一点鎖線にて示す)が必ず延出部45aに交差するように、延出寸法が設定されている。これによって、照射部から壁方向または天井方向に照射された放射線は必ず壁遮蔽部材25または天井遮蔽部材45のいずれかに当ることとなり、確実に遮蔽される。特に、壁遮蔽部材25と天井遮蔽部材45の隙間部分においても、放射線は、図4中、一点鎖線にて示すように、天井遮蔽部材45の延出部45aに当って、外部に漏れることはない。   The ceiling shielding member 45 is laid on the ceiling structure housing 35 and is arranged above the wall shielding member 25 with a predetermined interval. The ceiling shielding member 45 has a rectangular shape with a predetermined thickness, and is configured by stacking iron plates to a predetermined thickness. The short side portion of the ceiling shielding member 45 has the same length as the horizontal direction length of the wall shielding member 25. Moreover, the long side part of the ceiling shielding member 45 is longer than the distance between the outer surfaces of the wall shielding members 25 and 25 which oppose. That is, extending portions 45 a and 45 a that extend outward from the outer surface of the lower wall shielding member 25 are formed at both ends in the longitudinal direction of the ceiling shielding member 45. The extending portion 45a is such that a straight extension line (indicated by a one-dot chain line in FIG. 4) connecting the irradiation portion P and the indoor side upper end portion of the wall shielding member 25 intersects the extending portion 45a. The extension dimension is set. As a result, the radiation irradiated in the wall direction or the ceiling direction from the irradiating unit always strikes either the wall shielding member 25 or the ceiling shielding member 45 and is reliably shielded. In particular, even in the gap portion between the wall shielding member 25 and the ceiling shielding member 45, the radiation hits the extended portion 45 a of the ceiling shielding member 45 and leaks to the outside as shown by a one-dot chain line in FIG. 4. Absent.

天井打増しコンクリート層65は、天井遮蔽部材45の上面が露出するのを防止するために設けられている。天井打増しコンクリート層65は、上階に一般室がある場合や屋上設備がある場合に形成されるものである。このような構成によれば、天井遮蔽部材45が露出しないので、放射線の散乱を低減できる。また、天井打増しコンクリートは、構造体とする必要はないので、配筋量の増加を抑えることができる。天井打増しコンクリート層65には、コンクリートの割れや剥離を防止するための鉄筋またはメッシュシート(図示せず)が設けられている。なお、天井遮蔽部材45が配設されていない部分では、天井打増しコンクリート層65は、天井遮蔽部材45とその上部の天井打増しコンクリート層65とを合わせた厚さと同等の厚さに形成されている。   The ceiling reinforced concrete layer 65 is provided to prevent the upper surface of the ceiling shielding member 45 from being exposed. The ceiling reinforced concrete layer 65 is formed when there is a general room on the upper floor or when there is a rooftop facility. According to such a configuration, since the ceiling shielding member 45 is not exposed, scattering of radiation can be reduced. Moreover, since it is not necessary to make the ceiling-reinforced concrete into a structure, an increase in the amount of reinforcement can be suppressed. The reinforced concrete layer 65 is provided with reinforcing bars or mesh sheets (not shown) for preventing cracking and peeling of the concrete. Note that, in the portion where the ceiling shielding member 45 is not provided, the ceiling-reinforced concrete layer 65 is formed to a thickness equivalent to the combined thickness of the ceiling shielding member 45 and the ceiling-reinforced concrete layer 65 on the top thereof. ing.

本実施形態では、照射室2の下階に一般室が設けられている場合を示しているが、その場合は、床面も、放射能遮蔽性能が必要となる。したがって、床スラブ17内に床遮蔽部材80が設けられている。   In this embodiment, the case where a general room is provided on the lower floor of the irradiation room 2 is shown, but in that case, the floor surface also needs to have radiation shielding performance. Therefore, the floor shielding member 80 is provided in the floor slab 17.

床スラブ17は、図示しない上端筋と下端筋が所定のピッチで配置され、これらを覆うようにコンクリートが所定厚さで打設されて形成されている。床スラブ17では、床構造躯体81の上部に床遮蔽部材80を設置している。床遮蔽部材80は、床構造躯体81にアンカーで固定したり、床に落としこんだりして固定する。また、仕上げ等の必要性に応じて床遮蔽部材80はコンクリートに埋設しても良い。床遮蔽部材80は所望の放射線遮蔽性能を得られる厚さに形成されている。   The floor slab 17 is formed by placing upper and lower bars (not shown) at a predetermined pitch and placing concrete with a predetermined thickness so as to cover them. In the floor slab 17, a floor shielding member 80 is installed above the floor structure casing 81. The floor shielding member 80 is fixed to the floor structure 81 with an anchor or dropped onto the floor. Moreover, you may embed the floor shielding member 80 in concrete according to needs, such as finishing. The floor shielding member 80 is formed to a thickness that can obtain a desired radiation shielding performance.

床遮蔽部材80は、所定厚さの矩形形状を呈しており、鉄板を所定の厚さに積層して構成されている。床遮蔽部材80の短辺部(図4の紙面表裏方向に延長する辺)は、壁遮蔽部材25の水平方向長さと同じ長さである。また、床遮蔽部材80の長辺部(図4の紙面左右方向に延長する辺)は、対向する壁遮蔽部材25,25の外側表面間の距離よりも長い。すなわち、床遮蔽部材80の長手方向両端には、上方の壁遮蔽部材25の外側表面よりも外方に延出する延出部80a,80aが形成されている。延出部80aは、図示しない照射部Pと、壁遮蔽部材25の室内側下端部とを結んだ直線の延長線(図示せず)が必ず延出部80aに交差するように、延出寸法が設定されている。なお、床遮蔽部材80は、天井遮蔽部材45よりも壁遮蔽部材25の近くに配置されているので、延出部80aの延出寸法が、天井遮蔽部材45の延出部45aよりも短くて済む。以上のような構成によって、照射部から壁方向または床方向に照射された放射線は必ず壁遮蔽部材25または床遮蔽部材80のいずれかに当ることとなり、確実に遮蔽される。   The floor shielding member 80 has a rectangular shape with a predetermined thickness, and is configured by stacking iron plates to a predetermined thickness. The short side portion of the floor shielding member 80 (the side extending in the front and back direction in FIG. 4) has the same length as the horizontal length of the wall shielding member 25. Further, the long side portion of the floor shielding member 80 (the side extending in the left-right direction in FIG. 4) is longer than the distance between the outer surfaces of the opposing wall shielding members 25 and 25. That is, extending portions 80 a and 80 a that extend outward from the outer surface of the upper wall shielding member 25 are formed at both ends in the longitudinal direction of the floor shielding member 80. The extending portion 80a has an extension dimension so that a straight extension line (not shown) connecting the irradiation portion P (not shown) and the lower end on the indoor side of the wall shielding member 25 always intersects the extending portion 80a. Is set. Since the floor shielding member 80 is disposed closer to the wall shielding member 25 than the ceiling shielding member 45, the extension dimension of the extension portion 80a is shorter than the extension portion 45a of the ceiling shielding member 45. That's it. With the configuration as described above, the radiation irradiated in the wall direction or the floor direction from the irradiating unit always hits either the wall shielding member 25 or the floor shielding member 80 and is reliably shielded.

以上のような構成の放射線遮蔽構造1’によれば、第一実施形態と同様の作用効果の他に、壁構造躯体15を薄く出来るので、施工手間および施工コストの低減が図れるといった作用効果が得られる。また、本実施形態の放射線遮蔽構造1’によれば、下階への放射線遮蔽性能も得ることができる。   According to the radiation shielding structure 1 ′ having the above-described configuration, the wall structure housing 15 can be thinned in addition to the same effects as the first embodiment, so that the effect of reducing the labor and cost of construction can be achieved. can get. Further, according to the radiation shielding structure 1 ′ of the present embodiment, radiation shielding performance to the lower floor can be obtained.

以上、本発明を実施するための形態について説明したが、本発明は前記実施の形態に限定されず、本発明の趣旨を逸脱しない範囲で適宜設計変更が可能である。例えば、前記実施形態では、壁や天井の遮蔽部材は、放射線源を囲うように、壁および天井の一部に埋設されているが、これに限定されるものではない。放射線源の出力が大きい場合、および放射線の投影面が多方向に亘る場合には、部屋全体に壁遮蔽部材、天井遮蔽部材および床遮蔽部材を設けるようにしてもよい。さらに、放射線源は、高エネルギーリニアックに限定されるものでなく、照射面を形成する全ての放射線治療装置において適用可能である。   As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a design change is possible suitably. For example, in the said embodiment, although the shielding member of a wall and a ceiling is embed | buried under a part of a wall and a ceiling so that a radiation source may be enclosed, it is not limited to this. When the output of the radiation source is large, and when the projection plane of radiation extends in multiple directions, a wall shielding member, a ceiling shielding member, and a floor shielding member may be provided in the entire room. Furthermore, the radiation source is not limited to a high-energy linac, and can be applied to all radiation therapy apparatuses that form an irradiation surface.

本発明に係る放射線遮蔽構造を実施するための最良の第一の形態を示した鉛直方向断面図である。It is the perpendicular direction sectional view showing the best first form for carrying out the radiation shielding structure concerning the present invention. 本発明に係る放射線遮蔽構造を実施するための最良の第一の形態を示した水平方向断面図である。It is the horizontal direction sectional view showing the best first form for carrying out the radiation shielding structure concerning the present invention. 本発明に係る放射線遮蔽構造を実施するための最良の第一の形態を示した鉛直方向断面図である。It is the perpendicular direction sectional view showing the best first form for carrying out the radiation shielding structure concerning the present invention. 本発明に係る放射線遮蔽構造を実施するための最良の第二の形態を示した鉛直方向断面図である。It is the perpendicular direction sectional view showing the best 2nd form for carrying out the radiation shielding structure concerning the present invention. 本発明に係る放射線遮蔽構造を実施するための最良の第二の形態を示した水平方向断面図である。It is horizontal direction sectional drawing which showed the best 2nd form for implementing the radiation shielding structure which concerns on this invention. 従来の放射線遮蔽構造を示した鉛直方向断面図である。It is the vertical direction sectional view showing the conventional radiation shielding structure.

符号の説明Explanation of symbols

1 放射線遮蔽構造
2 照射室
3 高エネルギーリニアック(放射線源)
10 壁構造躯体
20 壁遮蔽部材
21 突出部
30 天井構造躯体
40 天井遮蔽部材
50 壁放射線反射防止層
60 天井打増しコンクリート層
1’ 放射線遮蔽構造
15 壁構造躯体
25 壁遮蔽部材
35 天井構造躯体
45 天井遮蔽部材
45a 延出部
55 打増しコンクリート層
65 天井打増しコンクリート層
1 Radiation shielding structure 2 Irradiation room 3 High energy linac (radiation source)
DESCRIPTION OF SYMBOLS 10 Wall structure housing 20 Wall shielding member 21 Protrusion part 30 Ceiling structure housing 40 Ceiling shielding member 50 Wall radiation reflection prevention layer 60 Ceiling-increase concrete layer 1 'Radiation shielding structure 15 Wall structure housing 25 Wall shielding member 35 Ceiling structure housing 45 Ceiling structure housing 45 Shielding member 45a Extension part 55 Additional concrete layer 65 Ceiling additional concrete layer

Claims (4)

放射線源となる高エネルギーリニアックを収容する照射室の放射線遮蔽構造において、
前記高エネルギーリニアックは、回転可能なガントリー部と、その回転中心に向かって全角度から放射線を照射可能な照射部とを備えており、
前記放射線遮蔽構造は、壁構造躯体と天井構造躯体とを構造的に一体形成してなる門型の鉄筋コンクリート造構造躯体を備え、
前記壁構造躯体の室内側の前記高エネルギーリニアックの側方の両側で放射線の照射方向に位置する壁には、放射線を遮蔽する壁遮蔽部材が立設され、
前記壁遮蔽部材は、前記照射部から壁に向かって横向きに照射される放射線の先端部を覆うことができる水平長さに形成されており、
前記壁遮蔽部材の下端が床面より下側に位置されるとともに、上端が天井面と略同等の高さに位置され、
前記壁遮蔽部材の上端部には、室内側に突出する突出部が壁遮蔽部材の水平長さ方向の全長に亘って形成され、
前記天井構造躯体の上には、放射線を遮蔽する天井遮蔽部材が前記壁遮蔽部材と分離し、互いに対向する壁遮蔽部材間の空間の上部を覆うように敷設され、
前記天井遮蔽部材は、長方形形状を呈しており、一辺部が前記壁遮蔽部材の水平方向長さと同じ長さであり、
前記壁遮蔽部材と前記天井遮蔽部材は、鉄板、鉛製のプレート、ポリエチレン製のプレートまたはボロン含有材のプレートのいずれかにて構成されており、
前記突出部は、前記放射線源となる高エネルギーリニアックから直線的に放射される放射線が前記天井遮蔽部材、前記壁遮蔽部材または前記突出部のいずれかに当たって遮蔽されるように、鉛直方向に断面視して、突出部の室内側先端部の上端部と前記照射部とを結んだ直線の延長線が前記天井遮蔽部材に交差するように形成されている
ことを特徴とする放射線遮蔽構造。
In the radiation shielding structure of the irradiation chamber that houses the high-energy linac as the radiation source,
The high-energy linac includes a rotatable gantry part and an irradiation part capable of emitting radiation from all angles toward the rotation center thereof,
The radiation shielding structure includes a gate-shaped reinforced concrete structure housing formed by integrally forming a wall structure housing and a ceiling structure housing.
The wall positioned in the radiation direction on both sides of the high energy linac on the indoor side of the wall structure housing is provided with a wall shielding member that shields radiation,
The wall shielding member is formed in a horizontal length capable of covering the distal end portion of the radiation irradiated laterally from the irradiation unit toward the wall,
The lower end of the wall shielding member is positioned below the floor surface, and the upper end is positioned at substantially the same height as the ceiling surface,
At the upper end of the wall shielding member, a protruding portion that protrudes indoors is formed over the entire length of the wall shielding member in the horizontal length direction ,
On the ceiling structure housing, a ceiling shielding member that shields radiation is separated from the wall shielding member, and is laid so as to cover an upper portion of a space between the wall shielding members facing each other ,
The ceiling shielding member has a rectangular shape, and one side portion has the same length as the horizontal length of the wall shielding member,
The wall shielding member and the ceiling shielding member are composed of any one of an iron plate, a lead plate, a polyethylene plate, or a boron-containing material plate,
The protrusion is a cross-sectional view in the vertical direction so that the radiation radiated linearly from the high-energy linac serving as the radiation source hits one of the ceiling shielding member, the wall shielding member, or the protrusion. And the radiation extended structure characterized by forming so that the linear extension line which connected the upper end part of the indoor side front-end | tip part of the protrusion part and the said irradiation part may cross | intersect the said ceiling shielding member .
放射線源となる高エネルギーリニアックを収容する照射室の放射線遮蔽構造において、
前記高エネルギーリニアックは、回転可能なガントリー部と、その回転中心に向かって全角度から放射線を照射可能な照射部とを備えており、
前記放射線遮蔽構造は、壁構造躯体と天井構造躯体とを構造的に一体形成してなる門型の鉄筋コンクリート造構造躯体を備え、
前記壁構造躯体の室内側の前記高エネルギーリニアックの側方の両側で放射線の照射方向に位置する壁には、放射線を遮蔽する壁遮蔽部材が立設され、
前記壁遮蔽部材は、前記照射部から壁に向かって横向きに照射される放射線の先端部を覆うことができる水平長さに形成されており、
前記壁遮蔽部材の下端が床面より下側に位置されるとともに、上端が天井面と略同等の高さに位置され、
前記天井構造躯体の上には、放射線を遮蔽する天井遮蔽部材が前記壁遮蔽部材と分離し、互いに対向する壁遮蔽部材間の空間の上部を覆うように敷設され、
前記天井遮蔽部材は、長方形形状を呈しており、一辺部が前記壁遮蔽部材の水平方向長さと同じ長さであり、
前記壁構造躯体側となる前記天井遮蔽部材の端部には、前記壁遮蔽部材の外側表面よりも外方に延出する延出部が形成され、
前記壁遮蔽部材と前記天井遮蔽部材は、鉄板、鉛製のプレート、ポリエチレン製のプレートまたはボロン含有材のプレートのいずれかにて構成されており、
前記延出部は、前記放射線源となる高エネルギーリニアックから直線的に放射される放射線が前記天井遮蔽部材、前記壁遮蔽部材または前記延出部のいずれかに当たって遮蔽されるように、鉛直方向に断面視して、当該延出部が位置する側の前記壁遮蔽部材の室内側の上端部と前記照射部とを結んだ直線の延長線が前記延出部に交差するように形成されている
ことを特徴とする放射線遮蔽構造。
In the radiation shielding structure of the irradiation chamber that houses the high-energy linac as the radiation source,
The high-energy linac includes a rotatable gantry part and an irradiation part capable of emitting radiation from all angles toward the rotation center thereof,
The radiation shielding structure includes a gate-shaped reinforced concrete structure housing formed by integrally forming a wall structure housing and a ceiling structure housing.
The wall positioned in the radiation direction on both sides of the high energy linac on the indoor side of the wall structure housing is provided with a wall shielding member that shields radiation,
The wall shielding member is formed in a horizontal length capable of covering the distal end portion of the radiation irradiated laterally from the irradiation unit toward the wall,
The lower end of the wall shielding member is positioned below the floor surface, and the upper end is positioned at substantially the same height as the ceiling surface,
On the ceiling structure housing, a ceiling shielding member that shields radiation is separated from the wall shielding member, and is laid so as to cover an upper portion of a space between the wall shielding members facing each other ,
The ceiling shielding member has a rectangular shape, and one side portion has the same length as the horizontal length of the wall shielding member,
At the end portion of the ceiling shielding member on the wall structure housing side, an extending portion that extends outward from the outer surface of the wall shielding member is formed,
The wall shielding member and the ceiling shielding member are composed of any one of an iron plate, a lead plate, a polyethylene plate, or a boron-containing material plate,
The extension portion is vertically arranged so that the radiation radiated linearly from the high energy linac serving as the radiation source hits any one of the ceiling shielding member, the wall shielding member, or the extension portion. In a cross-sectional view, a linear extension line connecting the upper end portion on the indoor side of the wall shielding member on the side where the extension portion is located and the irradiation portion intersects the extension portion . A radiation shielding structure characterized by that.
前記壁遮蔽部材の室内側にコンクリートにて形成され放射線の反射を防止する壁放射線反射防止層をさらに備えた
ことを特徴とする請求項1または請求項2に記載の放射線遮蔽構造。
The radiation shielding structure according to claim 1, further comprising a wall radiation antireflection layer that is formed of concrete on the indoor side of the wall shielding member and prevents reflection of radiation.
前記天井遮蔽部材の上側に形成される天井打増しコンクリート層をさらに備えた
ことを特徴とする請求項1乃至請求項3のいずれか1項に記載の放射線遮蔽構造。
The radiation shielding structure according to any one of claims 1 to 3, further comprising a ceiling-reinforced concrete layer formed on an upper side of the ceiling shielding member.
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