Department of Physics, University of Ibadan, Nigeria.
J Appl Clin Med Phys. 2012 Mar 8;13(2):3525. doi: 10.1120/jacmp.v13i2.3525.
The ability of concrete to attenuate ionizing radiation intensity is assessed using its linear or mass attenuation coefficient. In this work, the broad-beam linear and mass attenuation coefficients of different types of soils and cements used for making concrete were measured at different photon energies (60-1333 keV), nearly spanning the diagnostic photon energy range, using a NaI detector. The mass attenuation coefficients of cement decreased from 0.133 ± 0.002 at 60 keV to 0.047 ± 0.003 at 1332.5 keV. For soils, the mass attenuation coefficient of those collected from the beach was the highest, decreasing from 0.176 ± 0.003 cm²/g at 60 keV to 0.054 ± 0.001 cm²/g at 1332.5 keV. Land soils had the least value, decreasing from 0.124 ± 0.002 cm²/g at 60 keV to 0.044 ± 0.003 cm²/g at 1332.5 keV. Limestone had smaller mass attenuation coefficients than the cement produced using it. The implication of the above is that for making concrete, beach sand should be preferred as the sand component of the concrete. Models of the form μ(L) = A(E) exp[B(E)ρ] and μ(m) = αln(E)+β are proposed for fitting the linear attenuation coefficient and mass attenuation coefficient data, respectively.
混凝土衰减电离辐射强度的能力是通过其线性或质量衰减系数来评估的。在这项工作中，使用碘化钠探测器在不同光子能量（60-1333keV）下测量了用于制造混凝土的不同类型的土壤和水泥的宽束线性和质量衰减系数，几乎涵盖了诊断光子能量范围。水泥的质量衰减系数从 60keV 时的 0.133±0.002 降至 1332.5keV 时的 0.047±0.003。对于土壤，来自海滩的土壤的质量衰减系数最高，从 60keV 时的 0.176±0.003cm²/g 降至 1332.5keV 时的 0.054±0.001cm²/g。陆基土壤的数值最小，从 60keV 时的 0.124±0.002cm²/g 降至 1332.5keV 时的 0.044±0.003cm²/g。石灰岩的质量衰减系数小于用其制成的水泥。这意味着，在制造混凝土时，应优先选择海滩砂作为混凝土的砂成分。分别提出了形式为μ(L)=A(E)exp[B(E)ρ]和μ(m)=αln(E)+β的模型，用于拟合线性衰减系数和质量衰减系数数据。
