Novel Shielding Mortars for Radiation Source Transportation and Storage
Novel Shielding Mortars for Radiation Source Transportation and Storage
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DOI：
10.3390/su14031248
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发表时间：
2022-02-01
期刊：
影响因子：
3.9
通讯作者：
Elkhatib, Ahmed M.
中科院分区：
文献类型：
--
作者：
Sayyed, M. I.;Elsafi, Mohamed;Elkhatib, Ahmed M.
制备了新型砂浆M1(砂60%、水泥25%、球粘土10%、WO_3 15%)、M2(砂50%、水泥25%、球粘土10%、WO_3 25%)、M_3(砂60%、水泥25%、重晶石10%、WO_3 15%)、M_4(砂50%、水泥25%、重晶石10%、WO_3 25%)，考察了WO_3和重晶石对其辐射屏蔽性能和力学性能的影响。用5个放射性点源对辐射衰减系数进行了评估，并使用了碘化钠(NaI)闪烁探测器(3‘×3’)来检测放射源发出的伽马射线光子的衰减。砂浆样品的密度值在2.358~2.602 g/cm(3)范围内。砂浆的抗压强度和抗拉强度均随WO_3含量的增加而提高。M4砂浆的线性衰减系数(LAC)值最大。LAC测试结果表明，在砂浆中加入重晶石和较高比例的WO_3，可显著提高砂浆的辐射屏蔽性能。半值层(HVL)与能量之间的关系是直接的，因此被用来计算吸收或散射落在样品上的低能光子数量的一半所需的砂浆厚度。在0.06 MeV下，样品M1-M4的超高压值分别为0.412、0.280、0.242和0.184 cm。在1.408 MeV下获得的最高超音速分别为5.516、5.202、5.358和5.041厘米。因此，M4样品较薄的一层提供了与较厚的M1-M3样品相当的光子衰减和辐射防护。这种新材料有望在运输和长期储存过程中有效屏蔽辐射源。
New types of mortar, M1 (60% sand, 25% cement, 10% ball clay, and 15% WO3), M2 (50% sand, 25% cement, 10% ball clay, and 25% WO3), M3 (60% sand, 25% cement, 10% Barite, and 15% WO3), and M4 (50% sand, 25% cement, 10% Barite, and 25% WO3), were prepared and the impact of WO3 and barite on their radiation shielding performance and mechanical properties was evaluated. The radiation attenuation factors were evaluated using five radioactive point sources, and a sodium iodide (NaI) scintillation detector (3 '' x 3 '') was used to detect the attenuation of gamma ray photons emitted from radioactive sources. The density values of the mortar samples lie within the range of 2.358 and 2.602 g/cm(3). The compressive strength and the tensile strength of the prepared mortars increased with the increasing percentage of WO3. The M4 mortar had the highest linear attenuation coefficient (LAC) value. The LAC results demonstrated that adding barite and a high percentage of WO3 into the mortars notably enhanced the radiation shielding performance of the prepared mortar. The relationship between the half value layer (HVL) and the energy is direct, and so was used to calculate the thickness of mortar needed to absorb or scatter half the number of low-energy photons falling on the samples. At 0.06 MeV, the HVL values of the samples were 0.412, 0.280, 0.242, and 0.184 cm for samples M1-M4, respectively. The highest HVL values, obtained at 1.408 MeV, were 5.516, 5.202, 5.358, and 5.041 cm. Thus, a thinner layer of the M4 sample provided comparable attenuation of photons and radiation protection to the thicker M1-M3 samples. The new material is promising as an effective shield of radiation-emitting sources during transportation and long-term storage.