JP2019039775A - Decontamination effect evaluation method and decontamination method - Google Patents
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- 238000005202 decontamination Methods 0.000 title claims abstract description 223
- 230000003588 decontaminative effect Effects 0.000 title claims abstract description 200
- 230000000694 effects Effects 0.000 title claims abstract description 82
- 238000011156 evaluation Methods 0.000 title claims abstract description 33
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000012857 radioactive material Substances 0.000 claims abstract 2
- 239000000356 contaminant Substances 0.000 claims description 24
- 238000011109 contamination Methods 0.000 abstract description 25
- 239000002344 surface layer Substances 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 10
- 239000004567 concrete Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 239000000941 radioactive substance Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 4
- 239000002901 radioactive waste Substances 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、放射能汚染コンクリートなどの除染対象物に対する除染による効果を評価する除染効果評価方法、および、これを用いた除染方法に関するものである。 The present invention relates to a decontamination effect evaluation method for evaluating the effect of decontamination on a decontamination target such as radioactively contaminated concrete, and a decontamination method using the same.
原子力施設の廃止措置工事において、原子炉や再処理施設等の建屋コンクリート壁面や床面の放射能汚染部は、はつり工法をはじめとした種々の除染工法により除去されている（例えば、特許文献１を参照）。このような工事により発生する放射性廃棄物は放射能レベルで区分され、汚染レベルに応じた処分方法が適用される。放射性廃棄物をレベル別に分別し、合理的に処理・処分するため、はつり工法等の除染効果や、除染後の汚染残存状況を評価する方法が必要とされている。 In decommissioning work for nuclear facilities, radioactive contamination on building concrete walls and floors such as nuclear reactors and reprocessing facilities has been removed by various decontamination methods including suspension methods (for example, patent documents) 1). Radioactive waste generated by such construction is classified by radioactivity level, and disposal methods are applied according to the contamination level. In order to sort out radioactive waste by level and to treat and dispose of it rationally, there is a need for a decontamination effect such as a suspension method and a method for evaluating the residual contamination after decontamination.
除染効果等を評価する従来の方法としては、放射性物質を含む試料を用いるホット試験と、放射性物質を用いずに行うコールド試験が知られている。コールド試験では、例えば対象物にペンキ等の塗装を施すことで汚染を模擬した除染対象物を作製した後、模擬的な汚染部を除染し、塗装の残存状況を目視等でチェックすることで、除染効果を確認する。一方、ホット試験では、放射化した除染対象物を使用し、汚染部を除去した後の対象物の線量等を測定することで、除染効果を確認する。 As a conventional method for evaluating the decontamination effect, a hot test using a sample containing a radioactive substance and a cold test performed without using a radioactive substance are known. In the cold test, for example, after creating a decontamination object that simulates contamination by painting the object with paint or the like, the simulated contaminated part is decontaminated and the remaining state of the coating is checked visually. Then, confirm the decontamination effect. On the other hand, in the hot test, the decontamination effect is confirmed by using a radioactive decontamination object and measuring the dose of the object after removing the contaminated part.
ところで、実際の放射化コンクリートの汚染レベルは、放射化した微量元素の含有量により区分されるため、検出感度としては数ｐｐｍ〜数百ｐｐｍの検出能が必要である。 By the way, since the actual contamination level of activated concrete is classified according to the content of the activated trace elements, detection sensitivity of several ppm to several hundred ppm is required as detection sensitivity.
しかし、上記の塗装を用いたコールド試験は、ｐｐｍオーダーでの汚染残存有無の定量評価が困難であり、汚染レベルを正確に把握することができない。ホット試験は、コールド試験に比べて試験が大掛かりであり、試験期間が必要である。 However, in the cold test using the above-mentioned coating, it is difficult to quantitatively evaluate the presence or absence of contamination on the order of ppm, and the contamination level cannot be accurately grasped. The hot test is larger than the cold test and requires a test period.
また、はつり工法で除染対象物を物理的に除染する場合、はつり機の先端に付着した粉塵等がコンクリート壁面・床面に再付着し、除染後のコンクリート壁面・床面が再汚染（二次汚染）するおそれがある。しかし、二次汚染について検討するためのコールド試験は実施例が少なく、簡易的に除染効果を評価する方法が必要とされていた。 In addition, when the decontamination object is physically decontaminated by the hanger method, dust adhering to the tip of the hanger is reattached to the concrete wall and floor, and the decontaminated concrete wall and floor are recontaminated. There is a risk of secondary contamination. However, there are few examples of cold tests for examining secondary contamination, and a method for simply evaluating the decontamination effect has been required.
本発明は、上記に鑑みてなされたものであって、簡易的に除染効果を評価することのできる除染効果評価方法および除染方法を提供することを目的とする。 This invention is made | formed in view of the above, Comprising: It aims at providing the decontamination effect evaluation method and decontamination method which can evaluate a decontamination effect simply.
上記した課題を解決し、目的を達成するために、本発明に係る除染効果評価方法は、除染対象物に対する除染による除染効果を評価する方法であって、放射性物質を模擬したトレーサーを母材に混合して、模擬汚染材を作製するステップと、模擬汚染材に含まれるトレーサーの初期濃度を取得するステップと、所定の構造物の表層に模擬汚染材を設けて、模擬的な除染対象物を作製するステップと、模擬的な除染対象物を除染するステップと、除染後の模擬的な除染対象物から試料を採取し、試料に含まれるトレーサーの濃度を測定するステップと、試料に含まれるトレーサーの濃度と、模擬汚染材に含まれるトレーサーの初期濃度の差または比に基づいて、除染効果を評価するステップとを備えることを特徴とする。 In order to solve the above-described problems and achieve the object, the decontamination effect evaluation method according to the present invention is a method for evaluating the decontamination effect by decontamination on an object to be decontaminated, and is a tracer simulating a radioactive substance. Are mixed with the base material to produce a simulated contaminant, to obtain the initial concentration of the tracer contained in the simulated contaminant, and to provide a simulated contaminant on the surface layer of a predetermined structure. A step of preparing a decontamination object, a step of decontamination of a mock decontamination object, a sample is taken from the mock decontamination object after decontamination, and the concentration of the tracer contained in the sample is measured. And a step of evaluating the decontamination effect based on a difference or ratio between the concentration of the tracer contained in the sample and the initial concentration of the tracer contained in the simulated contaminant.
また、本発明に係る他の除染効果評価方法は、上述した発明において、模擬的な除染対象物の異なる位置に異なる除染深さを複数設定し、各位置を各除染深さで除染するステップと、各除染深さにおける除染効果を評価するステップとを備えることを特徴とする。 In addition, in the above-described invention, another decontamination effect evaluation method according to the present invention sets a plurality of different decontamination depths at different positions of the simulated decontamination target, and sets each position at each decontamination depth. The method includes a step of decontamination and a step of evaluating a decontamination effect at each decontamination depth.
また、本発明に係る他の除染効果評価方法は、上述した発明において、模擬汚染材の母材として建築用仕上材を用いることを特徴とする。 Further, another decontamination effect evaluation method according to the present invention is characterized in that, in the above-described invention, a building finishing material is used as a base material of the simulated contaminant.
また、本発明に係る除染方法は、除染対象物に対する除染方法であって、上述した除染効果評価方法により、除染対象物に対する除染効果を評価するステップと、評価した除染効果に基づいて模擬的な除染対象物が模擬する除染対象物に対する除染仕様を設定し、設定した除染仕様で除染対象物を除染するステップとを備えることを特徴とする。 Further, the decontamination method according to the present invention is a decontamination method for a decontamination object, the step of evaluating the decontamination effect for the decontamination object by the decontamination effect evaluation method described above, and the decontamination evaluated. A decontamination specification for the decontamination target simulated by the simulated decontamination target based on the effect, and decontamination of the decontamination target with the set decontamination specification.
本発明に係る除染効果評価方法によれば、除染対象物に対する除染による除染効果を評価する方法であって、放射性物質を模擬したトレーサーを母材に混合して、模擬汚染材を作製するステップと、模擬汚染材に含まれるトレーサーの初期濃度を取得するステップと、所定の構造物の表層に模擬汚染材を設けて、模擬的な除染対象物を作製するステップと、模擬的な除染対象物を除染するステップと、除染後の模擬的な除染対象物から試料を採取し、試料に含まれるトレーサーの濃度を測定するステップと、試料に含まれるトレーサーの濃度と、模擬汚染材に含まれるトレーサーの初期濃度の差または比に基づいて、除染効果を評価するステップとを備えるので、簡易的に除染効果等を評価することができるという効果を奏する。 The decontamination effect evaluation method according to the present invention is a method for evaluating the decontamination effect by decontamination on a decontamination object, wherein a tracer simulating a radioactive substance is mixed with a base material, A step of preparing, a step of obtaining an initial concentration of a tracer contained in the simulated contaminant, a step of preparing a simulated decontamination object by providing a simulated contaminant on the surface layer of a predetermined structure, and a simulated Decontaminating a decontamination object, taking a sample from the simulated decontamination object after decontamination, measuring the concentration of the tracer contained in the sample, and the concentration of the tracer contained in the sample. The step of evaluating the decontamination effect based on the difference or ratio of the initial concentration of the tracer contained in the simulated contaminant is provided, so that the decontamination effect and the like can be easily evaluated.
また、本発明に係る他の除染効果評価方法によれば、模擬的な除染対象物の異なる位置に異なる除染深さを複数設定し、各位置を各除染深さで除染するステップと、各除染深さにおける除染効果を評価するステップとを備えるので、除染深さ別の複数の除染効果を効率的に評価することができるという効果を奏する。 Further, according to another decontamination effect evaluation method according to the present invention, a plurality of different decontamination depths are set at different positions of the simulated decontamination object, and each position is decontaminated at each decontamination depth. Since the step and the step of evaluating the decontamination effect at each decontamination depth are provided, there is an effect that a plurality of decontamination effects according to the decontamination depth can be efficiently evaluated.
また、本発明に係る他の除染効果評価方法によれば、模擬汚染材の母材として建築用仕上材を用いるので、除染対象物を構成する鉄筋コンクリートなどの構造物の表層に対して、通常の建築工事で実施する表面仕上げの要領で容易に設けることができるという効果を奏する。 In addition, according to another decontamination effect evaluation method according to the present invention, since a finishing material for construction is used as a base material of a simulated contaminant, for the surface layer of a structure such as reinforced concrete constituting the decontamination object, There is an effect that it can be easily provided in the manner of surface finishing performed in normal construction work.
また、本発明に係る除染方法によれば、除染対象物に対する除染方法であって、上述した除染効果評価方法により、除染対象物に対する除染効果を評価するステップと、評価した除染効果に基づいて模擬的な除染対象物が模擬する除染対象物に対する除染仕様を設定し、設定した除染仕様で除染対象物を除染するステップとを備えるので、上述した除染効果評価方法で除染効果を予備的に確認することで、実際の除染対象物に対する除染作業等を効率的に実施することができるという効果を奏する。 Moreover, according to the decontamination method according to the present invention, the decontamination method for the decontamination object was evaluated by the step of evaluating the decontamination effect for the decontamination object by the decontamination effect evaluation method described above. The decontamination specification for the decontamination target simulated by the simulated decontamination target based on the decontamination effect is set, and the decontamination target is decontaminated with the set decontamination specification. By preliminarily confirming the decontamination effect using the decontamination effect evaluation method, there is an effect that the decontamination work and the like on the actual decontamination object can be efficiently performed.
以下に、本発明に係る除染効果評価方法および除染方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Embodiments of a decontamination effect evaluation method and a decontamination method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
［除染効果評価方法］
まず、本実施の形態に係る除染効果評価方法について説明する。
[Decontamination effect evaluation method]
First, the decontamination effect evaluation method according to the present embodiment will be described.
本実施の形態に係る除染効果評価方法は、あらかじめトレーサーを練混ぜた建築用仕上材等（母材）を模擬汚染材とし、これを対象物（例えば鉄筋コンクリート構造物）の表層に所定の厚み（汚染深さ）まで塗布・浸透させて模擬的な除染対象物を作製した後、任意の除染工法（例えば、はつり工法）で当該部分を除染するものである。そして、除染後の模擬的な除染対象物から粉体試料を採取し、化学分析によりトレーサーの濃度を確認することで、除染効果、汚染の残存状況および二次汚染の有無を簡易的に評価する。 In the decontamination effect evaluation method according to the present embodiment, a building finishing material or the like (base material) mixed with a tracer in advance is used as a simulated contaminant, and this is applied to a surface layer of an object (for example, a reinforced concrete structure) with a predetermined thickness. After applying and penetrating to (contamination depth) to prepare a simulated decontamination object, the part is decontaminated by an arbitrary decontamination method (for example, a hanger method). And by collecting powder samples from simulated decontamination objects after decontamination and confirming the tracer concentration by chemical analysis, the decontamination effect, the residual status of contamination and the presence or absence of secondary contamination can be simplified. To evaluate.
図１は、本実施の形態の実施手順を示したものである。この図に示すように、本実施の形態は、以下のＳＴＥＰ１〜ＳＴＥＰ６の手順で実施される。 FIG. 1 shows an implementation procedure of the present embodiment. As shown in this figure, the present embodiment is implemented in the following steps STEP1 to STEP6.
（ＳＴＥＰ１）
建築用仕上材等（例えば、モルタル、コンクリート）に放射性物質を模擬したトレーサーを混入し、模擬汚染材を作製する。トレーサーは、除染対象物が含有しない元素を含む化合物とする。除染対象物がコンクリートの場合には、例えばバリウム、ストロンチウム、ルビジウム、セシウム等の元素を含む化合物とすることができる。トレーサーの混入方法は、建築用仕上材等に粉体（例えば、硫酸バリウム）として直接混入する方法や、建築用仕上材等の練混ぜ水に液体（例えば、塩化バリウム水溶液）を溶かした上で練混ぜる方法等を用いることが好ましい。除染前のトレーサーの濃度Ｗ０（初期濃度）は、建築用仕上材等の重量に対するトレーサーの重量から算定することができる。
(STEP1)
A tracer simulating a radioactive substance is mixed into a building finishing material (eg, mortar, concrete) to produce a simulated contaminant. The tracer is a compound containing an element that the decontamination target does not contain. When the object to be decontaminated is concrete, for example, it can be a compound containing an element such as barium, strontium, rubidium, cesium and the like. The tracer can be mixed directly into a building finishing material, etc., as a powder (for example, barium sulfate) or after dissolving a liquid (for example, an aqueous barium chloride solution) in mixing water, such as a building finishing material. It is preferable to use a kneading method. The concentration W 0 (initial concentration) of the tracer before decontamination can be calculated from the weight of the tracer relative to the weight of the building finishing material or the like.
（ＳＴＥＰ２）
次に、汚染を模擬する対象物（構造物。例えば鉄筋コンクリート製の壁面）に対して、上記の模擬汚染材を任意の厚さｄ０で塗布・浸透させることにより、模擬的な除染対象物を作製する。模擬汚染材の塗布・浸透は、例えば使用する模擬汚染材が仕上モルタルであれば、通常の建築工事で実施する床仕上げの要領で施工することができる。
(STEP2)
Next, a simulated decontamination object is obtained by applying and penetrating the above-mentioned simulated pollutant at an arbitrary thickness d 0 to an object (structure, for example, reinforced concrete wall surface) that simulates contamination. Is made. For example, if the simulated contaminant to be used is finished mortar, the simulated contaminant can be applied and permeated in the manner of floor finishing performed in normal construction work.
（ＳＴＥＰ３）
模擬汚染材の塗布・浸透後、模擬的な除染対象物を任意の除染工法（例えば、はつり工法）で除染する。除染深さｄは、塗布・浸透面から任意の深さとする。除染効果を確認する場合、除染深さｄを複数設定するのも効果的である。なお、図の例では、模擬的な除染対象物の下側から順に段階的に異なる３つの除染深さｄ１、ｄ２、ｄ３（ｄ１＜ｄ２＜ｄ３）を設定している。このように、模擬的な除染対象物の異なる位置に異なる除染深さを複数設定し、各除染深さにおける除染効果を評価すれば、除染深さ別の複数の除染効果を効率的に評価することができる。
(STEP3)
After application and penetration of the simulated contaminant, the simulated decontamination object is decontaminated by an arbitrary decontamination method (for example, a hanger method). The decontamination depth d is an arbitrary depth from the application / penetration surface. When confirming the decontamination effect, it is also effective to set a plurality of decontamination depths d. In the example of the figure, three decontamination depths d 1 , d 2 , and d 3 (d 1 <d 2 <d 3 ) that are stepwise different from the lower side of the simulated decontamination target are set. ing. In this way, if a plurality of different decontamination depths are set at different positions of the simulated decontamination target and the decontamination effect at each decontamination depth is evaluated, a plurality of decontamination effects according to the decontamination depths are obtained. Can be evaluated efficiently.
（ＳＴＥＰ４）
次に、除染後の模擬的な除染対象物の表面から、チッピング等で粉体を採取する。
(STEP4)
Next, powder is collected by chipping or the like from the surface of the simulated decontamination target after decontamination.
（ＳＴＥＰ５）
次に、化学分析等により、採取した粉体に含まれるトレーサーの濃度Ｗｄ（除染後のトレーサーの濃度）を測定する。この測定結果については、例えば図に示すようなグラフ（トレーサーの濃度Ｗｄと塗布面からの深さｄの関係）で整理してもよい。
(STEP5)
Next, the concentration W d of the tracer contained in the collected powder (concentration of the tracer after decontamination) is measured by chemical analysis or the like. The measurement result may be arranged, for example, by a graph (relationship between the tracer concentration Wd and the depth d from the coating surface) as shown in the figure.
（ＳＴＥＰ６）
次に、除染前のトレーサーの濃度Ｗ０および除染後のトレーサーの濃度Ｗｄ（初期濃度）の濃度差もしくは濃度比から、除染効果、汚染の残存状況および二次汚染の有無を評価する。
(STEP6)
Next, the decontamination effect, the residual status of contamination, and the presence or absence of secondary contamination are evaluated from the concentration difference or concentration ratio of the tracer concentration W 0 before decontamination and the concentration W d (initial concentration) of the tracer after decontamination. To do.
このように、本実施の形態の除染効果評価方法によれば、トレーサーとして、除染対象物が含有しない元素を含む化合物を用いることで、除染工法（例えば、はつり工法等）の有効性や、除染後の対象物に対する汚染の残存状況および二次汚染を定量的かつ詳細に評価することができる。 As described above, according to the decontamination effect evaluation method of the present embodiment, the effectiveness of the decontamination method (for example, the hanger method) is used as the tracer by using a compound containing an element that the decontamination target does not contain. In addition, it is possible to evaluate quantitatively and in detail the residual state of contamination and secondary contamination on the object after decontamination.
また、ホット試験や実施工の実施前に上記の除染効果評価方法を実施することで、除染効果を予備的に確認することができる。また、化学分析により、トレーサーをｐｐｍオーダーで検出することができ、実際の放射性廃棄物の汚染レベルの区分との整合性が取れる。また、建築用仕上材等の塗布・浸透厚さを適宜設定することで、模擬する汚染の深さを制御することができる。 In addition, the decontamination effect can be preliminarily confirmed by carrying out the decontamination effect evaluation method described above before the hot test or the implementation work. Furthermore, tracers can be detected in the order of ppm by chemical analysis, and consistency with the actual radioactive waste contamination level classification can be obtained. In addition, the depth of contamination to be simulated can be controlled by appropriately setting the application / penetration thickness of a building finishing material or the like.
さらに、除染効果および二次汚染の有無を定量的に評価することで、除染後の除染対象物の汚染レベルを正確に評価することができ、放射性廃棄物の処理・処分の効率化や、処分費用の低減につながる。 Furthermore, by quantitatively evaluating the decontamination effect and the presence or absence of secondary contamination, the contamination level of the decontamination target after decontamination can be accurately evaluated, and the efficiency of processing and disposal of radioactive waste is improved. And lead to a reduction in disposal costs.
［除染方法］
次に、本実施の形態に係る除染方法について説明する。
[Decontamination method]
Next, the decontamination method according to the present embodiment will be described.
本実施の形態に係る除染方法は、実際の除染対象物に対する除染方法であって、上述した除染効果評価方法により、除染対象物に対する除染効果を評価するステップと、評価した除染効果に基づいて模擬的な除染対象物が模擬する実際の除染対象物に対する除染仕様を設定し、設定した除染仕様で除染対象物を除染するステップとを備えるものである。この除染方法によれば、上記の除染効果評価方法で除染効果を予備的に確認しておくことで、実際の除染対象物に対する除染作業等を効率的に実施することができる。 The decontamination method according to the present embodiment is a decontamination method for an actual decontamination object, and evaluated by the above-described decontamination effect evaluation method for evaluating the decontamination effect for the decontamination object. A step of setting a decontamination specification for an actual decontamination target simulated by a simulated decontamination target based on the decontamination effect, and decontaminating the decontamination target with the set decontamination specification. is there. According to this decontamination method, it is possible to efficiently carry out decontamination work on an actual decontamination object by preliminarily confirming the decontamination effect by the above-mentioned decontamination effect evaluation method. .
以上説明したように、本発明に係る除染効果評価方法によれば、除染対象物に対する除染による除染効果を評価する方法であって、放射性物質を模擬したトレーサーを母材に混合して、模擬汚染材を作製するステップと、模擬汚染材に含まれるトレーサーの初期濃度を取得するステップと、所定の構造物の表層に模擬汚染材を設けて、模擬的な除染対象物を作製するステップと、模擬的な除染対象物を除染するステップと、除染後の模擬的な除染対象物から試料を採取し、試料に含まれるトレーサーの濃度を測定するステップと、試料に含まれるトレーサーの濃度と、模擬汚染材に含まれるトレーサーの初期濃度の差または比に基づいて、除染効果を評価するステップとを備えるので、簡易的に除染効果等を評価することができる。 As described above, according to the decontamination effect evaluation method according to the present invention, it is a method for evaluating the decontamination effect by decontamination on an object to be decontaminated, and a tracer simulating a radioactive substance is mixed with a base material. A simulated decontamination object is prepared by providing a simulated contaminant, a step of obtaining an initial concentration of the tracer contained in the simulated contaminant, and providing a simulated contaminant on the surface layer of a predetermined structure. A step of decontaminating a mock decontamination object, collecting a sample from the mock decontamination object after decontamination, measuring the concentration of the tracer contained in the sample, Since the step of evaluating the decontamination effect based on the difference or ratio between the concentration of the included tracer and the initial concentration of the tracer included in the simulated contaminant is provided, the decontamination effect and the like can be easily evaluated. .
また、本発明に係る他の除染効果評価方法によれば、模擬的な除染対象物の異なる位置に異なる除染深さを複数設定し、各位置を各除染深さで除染するステップと、各除染深さにおける除染効果を評価するステップとを備えるので、除染深さ別の複数の除染効果を効率的に評価することができる。 Further, according to another decontamination effect evaluation method according to the present invention, a plurality of different decontamination depths are set at different positions of the simulated decontamination object, and each position is decontaminated at each decontamination depth. Since the step and the step of evaluating the decontamination effect at each decontamination depth are provided, a plurality of decontamination effects for each decontamination depth can be efficiently evaluated.
また、本発明に係る他の除染効果評価方法によれば、模擬汚染材の母材として建築用仕上材を用いるので、除染対象物を構成する鉄筋コンクリートなどの構造物の表層に対して、通常の建築工事で実施する表面仕上げの要領で容易に設けることができる。 In addition, according to another decontamination effect evaluation method according to the present invention, since a finishing material for construction is used as a base material of a simulated contaminant, for the surface layer of a structure such as reinforced concrete constituting the decontamination object, It can be easily provided in the manner of surface finishing performed in normal construction work.
また、本発明に係る除染方法によれば、除染対象物に対する除染方法であって、上述した除染効果評価方法により、除染対象物に対する除染効果を評価するステップと、評価した除染効果に基づいて模擬的な除染対象物が模擬する除染対象物に対する除染仕様を設定し、設定した除染仕様で除染対象物を除染するステップとを備えるので、上述した除染効果評価方法で除染効果を予備的に確認することで、実際の除染対象物に対する除染作業等を効率的に実施することができる。 Moreover, according to the decontamination method according to the present invention, the decontamination method for the decontamination object was evaluated by the step of evaluating the decontamination effect for the decontamination object by the decontamination effect evaluation method described above. The decontamination specification for the decontamination target simulated by the simulated decontamination target based on the decontamination effect is set, and the decontamination target is decontaminated with the set decontamination specification. By preliminarily confirming the decontamination effect using the decontamination effect evaluation method, it is possible to efficiently carry out decontamination work on an actual decontamination object.
以上のように、本発明に係る除染効果評価方法および除染方法は、放射能汚染コンクリートなどの除染対象物に対する除染効果を評価するのに有用であり、特に、除染効果を簡易的に評価するのに適している。 As described above, the decontamination effect evaluation method and the decontamination method according to the present invention are useful for evaluating the decontamination effect on an object to be decontaminated such as radioactively contaminated concrete. It is suitable for evaluation.
Claims (4)
放射性物質を模擬したトレーサーを母材に混合して、模擬汚染材を作製するステップと、
模擬汚染材に含まれるトレーサーの初期濃度を取得するステップと、
所定の構造物の表層に模擬汚染材を設けて、模擬的な除染対象物を作製するステップと、
模擬的な除染対象物を除染するステップと、
除染後の模擬的な除染対象物から試料を採取し、試料に含まれるトレーサーの濃度を測定するステップと、
試料に含まれるトレーサーの濃度と、模擬汚染材に含まれるトレーサーの初期濃度の差または比に基づいて、除染効果を評価するステップとを備えることを特徴とする除染効果評価方法。 A method for evaluating the decontamination effect of decontamination on a decontamination object,
Mixing a tracer simulating radioactive material with a base material to produce a simulated contaminant;
Obtaining an initial concentration of the tracer contained in the simulated contaminant;
Providing a simulated contaminant on the surface of a predetermined structure to produce a simulated decontamination object;
Decontamination of a mock decontamination object;
Collecting a sample from a simulated decontamination object after decontamination and measuring the concentration of the tracer contained in the sample;
A decontamination effect evaluation method comprising: a step of evaluating a decontamination effect based on a difference or ratio of a tracer concentration contained in a sample and an initial concentration of a tracer contained in a simulated contaminant.
請求項１〜３のいずれか一つに記載の除染効果評価方法により、除染対象物に対する除染効果を評価するステップと、
評価した除染効果に基づいて模擬的な除染対象物が模擬する除染対象物に対する除染仕様を設定し、設定した除染仕様で除染対象物を除染するステップとを備えることを特徴とする除染方法。 A decontamination method for a decontamination object,
By the decontamination effect evaluation method according to any one of claims 1 to 3, a step of evaluating a decontamination effect on an object to be decontaminated;
Setting a decontamination specification for a decontamination target simulated by a simulated decontamination target based on the evaluated decontamination effect, and decontaminating the decontamination target with the set decontamination specification. Characterized decontamination method.
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