(Determination of Natural Radionuclides Concentrations and Radiological Hazard Index due to Application of Condisoil® on Hibiscus cannabinus (Kenaf) Cultivation)

The objectives of this study were to determine the natural radioactivity concentrations (Ra-226, Ra-228 and K-40) in soil, water and plant due to the application of Condisoil (R), soil-to-plant transfer factor and radiological hazard index due to the application of Condisoil (R). A total of 4 soils, 14 waters and 4 plants samples have been analysed using gamma spectrometry system. The results showed that the activity concentrations of Ra-226, Ra-228 and K-40 in soils treated with Condisoil (R) ranged from 13.8 - 17.6, 15.7 - 21.0 and 44.5 - 57.7 Bq kg(-1), respectively. The activity concentrations of Ra-226, Ra-228 and K-40 in plants ranged from 5.0 - 18.5, 0.1 - 1.5 and 42.7 - 321.8 Bq kg(-1), respectively. In addition to that, the activity concentrations of Ra-226, Ra-228 and K-40 in water was in the ranged of 0.3 - 0.9, 0.3 - 3.9 and 1.4 - 11.6 Bq L-1, respectively. The soil-to-plant transfer factor for Ra-226, Ra-228 and K-40 were in the ranged of 0.42 - 0.71, 0.01 - 0.08 and 0.85 - 5.34, respectively. The radiological hazard assessment found that the radium equivalent index was lower than the recommended limit of 370 Bq kg(-1). Therefore, this study concludes that the application of Condisoil (R) as soil amelioration does not contribute to the accumulation of natural radionuclide in the environment as well as does not pose a significant radiological risk to human.