本文關(guān)鍵詞：電子輻照加速器屏蔽墻中預(yù)埋管道傾角對(duì)輻射防護(hù)性能影響的蒙特卡羅計(jì)算　出處：《輻射防護(hù)》2017年01期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 電子輻照裝置 傾角 管道 MCNP

【摘要】：電子輻照裝置屏蔽墻中總存在一些較大口徑的管道如輻照電纜傳輸孔道,這些管道的存在勢(shì)必會(huì)降低屏蔽體的局部屏蔽能力。為定量評(píng)估管道對(duì)屏蔽效果的影響,本文以3 Me V電子輻照加速器為例,采用蒙特卡羅MCNP程序分別模擬計(jì)算了電子打靶以后產(chǎn)生的能譜中1 Me V以下和1 Me V以上不同單能光子入射同一屏蔽體時(shí),管道以不同角度穿透屏蔽墻時(shí)管道出口處及屏蔽墻外輻射場(chǎng)分布;并比較了在不同墻厚下這兩個(gè)能段對(duì)管道出口處輻射場(chǎng)的影響程度。計(jì)算結(jié)果表明:不同單能光子入射屏蔽體,在管道穿墻角度≥45°時(shí),管道出口處輻射場(chǎng)變化不再明顯,對(duì)于1 Me V以下的低能光子在墻外的透射輻射場(chǎng)基本可忽略,對(duì)于1 Me V以上的能量光子,其墻外光子透射輻射場(chǎng)隨角度增大影響顯著;隨著墻厚增加,低能光子衰減越顯著,高能光子在管道穿墻夾角設(shè)計(jì)中越占據(jù)了主導(dǎo)地位。
[Abstract]:Some of the larger diameter pipes such as irradiation cable transmission channel exists in the electron irradiation device shielding wall, the presence of the pipeline is bound to reduce the local shielding ability of shielding. For quantitative evaluation of the effects of the shielding effect of the pipeline, taking 3 Me V electron irradiation accelerator as an example, using Monte Carlo simulation program MCNP respectively after the electronic target the calculation of energy spectrum in 1 Me V and 1 Me V under different single photon incident with a shield, pipe at different angles through the shield wall pipe outlet and shielding wall radiation field distribution; and compared the different wall thickness in the two section of the pipeline at the outlet of the radiation energy the degree of influence. The calculation results show that the different single photon incident shield in the pipeline wall angle greater than 45 degrees, the pipeline at the outlet of the radiation field changes are not obvious, for the 1 Me below V low energy photon on the outside of the wall The transmission radiation field is basically negligible. For the energy photon above 1 Me V, the photon transmission radiation field outside the wall has a significant effect with the increase of the angle. With the increase of wall thickness, the attenuation of the low energy photon is more significant, and the high-energy photon occupies a leading position in the design of the pipeline through the wall corner.

【作者單位】： 中國(guó)科學(xué)技術(shù)大學(xué)核科學(xué)技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(NSFC11375182) 安徽省科技攻關(guān)計(jì)劃項(xiàng)目(1401042001)
【分類(lèi)號(hào)】：R142
【正文快照】： 近年來(lái)加速器技術(shù)發(fā)展迅速,其應(yīng)用范圍不斷拓寬,覆蓋了腫瘤治療、放射性同位素藥品制備、材料輻照交聯(lián)、消毒滅菌等生產(chǎn)生活的各個(gè)方面。輻照加工產(chǎn)業(yè)的快速發(fā)展推動(dòng)了作為輻射加工主要設(shè)備的工業(yè)電子加速器的快速發(fā)展。隨著工業(yè)加速器應(yīng)用的發(fā)展,工業(yè)電子加速器屏蔽設(shè)計(jì)的重

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