目的：本研究将重点关注埃及沿海地区发生的环境和放射生态学影响，基于对238U、137 Cs、232Th、40K的放射化学测量。该研究的新颖之处在于使用新技术，结合两个生物型RESRAD模型，对不同消耗的海洋生物中放射性核素的生物蓄积进行概率估计，并确定不同年龄段人类患癌风险的概率。 材料和方法：共采集了20个水样品，并装入干净的容器中，利用不同的质量保证工具测量其衰变产物的Bq.L-1。本研究将使用不同的统计分析方法，以及不同的RESRAD建模代码，预测所研究地区的环境和放射生态学影响的程度，这将有助于确定不同放射性核素的转移和积累所导致的影响。 结果：结果显示，在Th-232（mrem/pCi）中，成年人年龄为5、10、15时，最高人体剂量转换因子值最高，而在人工137Cs中观察到最低的摄入转换因子值。另一方面，成年人年龄为5、10、15时，人工Cs-137（mrem/pCi）的外部风险因子值最高，而U-238的外部风险因子值则最低。这将导致持续监测不同海洋沿海地区中的人工Cs-137。通过使用RESRAD-Biota计算得出的甲壳动物的生物蓄积值（BIV）排列顺序为：U-238 > Th-232 > Cs-137，而鱼类的BIV排列顺序为：Cs-137 > U-232 > Th-232。另一方面，甲壳动物的内部剂量转换因子排列顺序为：U-238 > Th-232 > Cs-137。而鱼类的内部剂量转换因子排列顺序为：Cs-137 > Th-232 > U-238。 结论：RESRAD代码的结果显示，生物蓄积和剂量转换因子的排列方式取决于海洋生物的类型。RESRAD代码还显示，成人与所有婴儿（5、10和15岁）相比，计算得出的外部风险因子值有所增加，这可能与生长阶段人体细胞的持续更替有关。研究结果显示，人工Cs-137在海洋生物和人体中的环境生物蓄积影响非常显著，这将支持摄入Cs-137进入人体（软组织内），与人类患癌风险的概率之间的关系。另一方面，研究结果显示，对于未来的工业沿海项目，使用RESRAD BIOA代码进行环境影响评价的生态学和放射学研究的重要性。

Purpose: This work will focused on the environmental and radio-ecological impacts occurred on an Egyptian coastal region, based on the radiochemical measurement of 238U, 137 Cs, 232Th, 40K. The novelty of the study was cleared by the using of new technique showing the integration of two biological RESRAD models, lead to a probabilistic estimation of the radionuclides bioaccumulation in different consumed marine organisms and determination the probability of human cancer risk at different ages.Material and methods: The 20 water samples were collected and mounted into clean containers, and their decay products, were measured in Bq.L-1, using different quality assurance tools. The study will used different statistical analysis and different RESRAD modeling codes were used in the study to predict the degree of environmental and radio-ecological impacts at the studied area, this will be helpful in order to define the impacts resulted from the transferring and accumulation of different radionuclides.Results: showed that the highest human dose conversion factor values of (5, 10, 15, with adult ages) were measured in Th-232 (mrem/pCi) while the lowest ingestion conversion factors values were observed in artificial 137Cs. On the other hand the highest values of external risk factor in case of (5, 10, 15 with adult age) were observed in artificial Cs-137(mrem/pCi), while the lowest value of external risk factor with the same ages were observed in U-238. This will lead to continual monitoring of artificial Cs-137 in different marine coastal regions. The arrangement of the bioaccumulation value (BIV) in Bq.kg-1 which being calculated by using RESRAD-Biota in case of crustacean animals will be as follow: U-238 > Th-232 > Cs-137, while the arrangement of BIV in case of fish animals will be: Cs-137 > U-232 > Th-232. On the other hand the arrangement of Internal Dose Conversion factors in case of crustacean animals will be: U-238 > Th-232 > Cs-137. While the arrangement of Internal Dose Conversion factors in case of fish animals will be: Cs-137> Th-232 > U-238.Conclusion: RESRAD code's results showed that the arrangement of the bioaccumulation and Dose Conversion factors were depend on the type of marine living organism. RESRAD code also showed that there are increments of the calculated external risk factor values which resulted from the adult than all the infants (5,10and 15 ages) ages this may be related to the continuous replacement of new human's body cells during the growth stages. The study results showed that, environmental bioaccumulation impacts of the artificial Cs-137 were very effective in both marine living organisms and human as this will support the relation between the ingestion Cs-137 in the body(inside the soft tissues), and the probability of the human cancer risk. On the other hand, study results showed the importance of using RESRAD BIOA code for the EIA's ecological and radiological studies which should be done for any future industrial coastal .projects.