Fifteen Porcelain and Ceramic Dinner Wares samples (collected from local commercial suppliers—Jeddah Saudi Arabia) were studied applying X-Ray Diffraction and Atomic Absorption techniques were used to study the Chemi...Fifteen Porcelain and Ceramic Dinner Wares samples (collected from local commercial suppliers—Jeddah Saudi Arabia) were studied applying X-Ray Diffraction and Atomic Absorption techniques were used to study the Chemical, Mineral, Compositions Concentrations (of Some Metals). In addition, the Natural Radioactivity measurements of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K, was used by a high-purity germanium (HPGe) detector. X-ray diffraction results showed that the major mineral constituents of 15 samples were quartz (SiO<sub>2</sub>) (except one), minor and trace elements vary from sample to sample. Atomic absorption spectroscopy results of the concentrations for (Al, Pb, Bi, U, Th and K) in (ppm) showed that Al<sub>2</sub>O average was 10.3 (ppm) (10%) less than the acceptable value. PbO, its average was 1.65 ppm which was slightly greater than the allowed value 1.35 ppm. Bi concentrations for all samples were lower than (DL < 10). For most samples U, concentrations were lower than (DL < 5) except samples C9 and C11. Th concentrations ranged from LDL (<1 to 52.88) and were much greater than the acceptable value 7.24 ppm except samples P1, P2, P4. The potassium concentration average was greater than the acceptable value. The average concentrations of <sup>238</sup>U, <sup>232</sup>Th and <sup>40</sup> K were (83.83, 91.05 and 751.07) Bq/kg dry. The radium equivalent activity concentration <em>Ra</em><sub><em>eq</em></sub> (Bq/kg) (302.61) was less than recommended value (370), gamma dose rate <em>D</em> (nGy/h) average (140.15) was much higher than the recommended value (60) (UNSCEER). <em>D</em><sub><em>eff</em></sub> (mSv/year) and <em>H</em><sub><em>ix</em></sub> were below the published admissible limit ≤ 1 and the risk is negligible. This study offers needed information for consumers at exposure risk and is useful to be found in terms of radiation protection.展开更多
In this work, gamma-ray spectroscopy based on semiconductor hyper pure germanium (HPGe) detector was used to evaluate the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the ...In this work, gamma-ray spectroscopy based on semiconductor hyper pure germanium (HPGe) detector was used to evaluate the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) for thirty samples of igneous and sedimentary rocks of Al-Atawilah (Al-Baha). The mean values of the activity concentrations of U-238 (Ra-226), Th-232, K-40 and Cs-137 in the igneous samples are found as (11.0, 11.50, 1172.71, 1.47) Bq/Kg respectively. In the sedimentary rocks, the mean values of the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) equal to (12.04, 13.18, 1131.36, 1.60) Bq/Kg respectively. The averages of radiological hazards (<em>Ra</em><sub><em>eq</em></sub>, <em>H</em><sub><em>ex</em></sub> and <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub>) were calculated and found to be within the UNSCEAR permissible limit values (370 Bq/kg for <em>Ra</em><sub><em>eq</em></sub>, and 1 for <em>H</em><sub><em>ex</em></sub> and <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub>), except for a slight increase of average value of <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub> in the igneous rock samples (1.36). The results indicate that the dose rate values depend on the kind of rocks (high in some igneous rock samples, and most of sedimentary rock samples have low dose rate). The activities of naturalnuclides were predicted and simulated in T time using a written MATLAB R2020a script based on the average activity concentrations and respective half-lives of U-238 and Th-232 series, and K-40, this is to evaluate the future effects of natural radionuclides on the population and estimate the human inputs in the future.展开更多
文摘Fifteen Porcelain and Ceramic Dinner Wares samples (collected from local commercial suppliers—Jeddah Saudi Arabia) were studied applying X-Ray Diffraction and Atomic Absorption techniques were used to study the Chemical, Mineral, Compositions Concentrations (of Some Metals). In addition, the Natural Radioactivity measurements of <sup>226</sup>Ra, <sup>232</sup>Th and <sup>40</sup>K, was used by a high-purity germanium (HPGe) detector. X-ray diffraction results showed that the major mineral constituents of 15 samples were quartz (SiO<sub>2</sub>) (except one), minor and trace elements vary from sample to sample. Atomic absorption spectroscopy results of the concentrations for (Al, Pb, Bi, U, Th and K) in (ppm) showed that Al<sub>2</sub>O average was 10.3 (ppm) (10%) less than the acceptable value. PbO, its average was 1.65 ppm which was slightly greater than the allowed value 1.35 ppm. Bi concentrations for all samples were lower than (DL < 10). For most samples U, concentrations were lower than (DL < 5) except samples C9 and C11. Th concentrations ranged from LDL (<1 to 52.88) and were much greater than the acceptable value 7.24 ppm except samples P1, P2, P4. The potassium concentration average was greater than the acceptable value. The average concentrations of <sup>238</sup>U, <sup>232</sup>Th and <sup>40</sup> K were (83.83, 91.05 and 751.07) Bq/kg dry. The radium equivalent activity concentration <em>Ra</em><sub><em>eq</em></sub> (Bq/kg) (302.61) was less than recommended value (370), gamma dose rate <em>D</em> (nGy/h) average (140.15) was much higher than the recommended value (60) (UNSCEER). <em>D</em><sub><em>eff</em></sub> (mSv/year) and <em>H</em><sub><em>ix</em></sub> were below the published admissible limit ≤ 1 and the risk is negligible. This study offers needed information for consumers at exposure risk and is useful to be found in terms of radiation protection.
文摘In this work, gamma-ray spectroscopy based on semiconductor hyper pure germanium (HPGe) detector was used to evaluate the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) for thirty samples of igneous and sedimentary rocks of Al-Atawilah (Al-Baha). The mean values of the activity concentrations of U-238 (Ra-226), Th-232, K-40 and Cs-137 in the igneous samples are found as (11.0, 11.50, 1172.71, 1.47) Bq/Kg respectively. In the sedimentary rocks, the mean values of the activity concentrations of the natural radionuclides (U-238 (Ra-226), Th-232 and K-40) and the fallout nuclide (Cs-137) equal to (12.04, 13.18, 1131.36, 1.60) Bq/Kg respectively. The averages of radiological hazards (<em>Ra</em><sub><em>eq</em></sub>, <em>H</em><sub><em>ex</em></sub> and <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub>) were calculated and found to be within the UNSCEAR permissible limit values (370 Bq/kg for <em>Ra</em><sub><em>eq</em></sub>, and 1 for <em>H</em><sub><em>ex</em></sub> and <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub>), except for a slight increase of average value of <em>I</em><sub><em><span style="white-space:nowrap;"><span style="white-space:nowrap;">γ</span></span></em></sub> in the igneous rock samples (1.36). The results indicate that the dose rate values depend on the kind of rocks (high in some igneous rock samples, and most of sedimentary rock samples have low dose rate). The activities of naturalnuclides were predicted and simulated in T time using a written MATLAB R2020a script based on the average activity concentrations and respective half-lives of U-238 and Th-232 series, and K-40, this is to evaluate the future effects of natural radionuclides on the population and estimate the human inputs in the future.