This study aims to evaluate the specific activity levels in soil and shore-sediment samples due to natural radionuclides; ²³⁸U, ²³²Th and ⁴⁰K, and man-made ¹³⁷Cs of Al–Nigella site, Marsa Matrouh government, Egypt. Soil and shore sediment sample selection, preparation, energy and efficiency calibration, Minimum Detectable Activity (MDA) of the HPGe detector was carried out according to the standard approaches. The activity concentrations of the samples ranged from 3.16 ± 0.04 to 36.28 ± 0.83 Bq kg⁻¹ for ²³⁸U series, 0.582 ± 0.01 to 33.35 ± 0.62 Bq kg⁻¹ for ²³²Th series and 7.38 ± 0.18 to 477.64 ± 8.12 Bq kg⁻¹ for ⁴⁰K and 0.088 ± 0.002 to 3.98 ± 0.09 Bq kg⁻¹ for the artificial ¹³⁷Cs. The Radiological contour maps for Al–Nigella were drawn using Surfer_13 software and the hazards index was estimated according to the results of the radioactivity measurements and their levels. All results obtained are within the permissible world average values and compared with the activity concentrations in different countries. The values of the calculated air absorbed gamma dose rate D, Annual effective dose E, Radium equivalent (Ra_eq), External hazard index (H_ex) and Gamma index (Iγ) are below the average international recommended limits as reported by UNSCEAR 2008.

Industrial wastewater frequently contains a huge of pollutants, such as heavy metals, dyes, and organic compounds, leading to considerable environmental discharge. Methylene Blue (MB), a cationic dye extensively utilized in the textile and pharmaceutical sectors, presents significant hazards to aquatic environments and human health. Exposure to MB may result in negative effects, including dermal irritation, stomach discomfort, and possible long-term ecological consequences. This research investigates the elimination of MB from synthetic industrial wastewater utilizing a geopolymer derived from Partially De-aluminated Metakaolin (PDK) by using adsorption technique it is a simple, low-cost, and effective method for removing a variety of pollutants. The geopolymeric materials were analysed using XRF, XRD, FTIR, SEM, EDX, and BET to confirm its structure then used for MB removal. The specific surface area of the geopolymer was determined to be 9.3 m²/g and a pore volume of 0.024 m³/g. Its kinetics and isotherms were investigated in the MB dye adsorption experiments. The adsorption was influenced by dose, initial dye concentration, pH, and contact time. According to the results, the maximum adsorption capacity (8 mg/g) was attained at 60 mg/L MB, 60 min of contact time, and pH 7–12 for one hour. The experimental data indicated that Freundlich isotherm model was the best-fit model to describe the sorption of MB on the synthesised geopolymer with higher determination coefficients R² of 0.996. Value of n greater than unity indicates a favourable adsorption taking place. This indicated that the adsorption occurs under a multilayer and heterogeneous surface for MB. The adsorption kinetics of MB onto GP was investigated using pseudo first order, and pseudo second order models as shown in, using the experimental data at various initial concentrations. The calculated parameters values obtained from the application of three models are tabulated. By comparing R² for each applied model and the compatibility between the estimated and observed q_e values, the most favourable model may be identified. The pseudo 2^nd order R² value are greater than other models.