Isotopic Ratio of Radionuclides in Natural Materials

Abstract

In this work, the 235U/238U ratio and 235U concentration were discussed. 235,238 U isotopes were measured and calculated for uranium mines samples and reference material. The difference and deviation in experimental and calculated values for 235U were discussed. It can be concluded that the 235U/238U ratio was varied naturally with a range of 0.0442 to 0.0478. The measured ratio was deviated upon the reference value (0.0462) with a range of -0.02% to 1.5%, as we can conclude that the measured values were very accurate. While the values of the calculated ratio were varied from -0.089% up to 17%, which represents low accuracy. Isotopic uranium ratio changes over time depending on spontaneous fission half-life, radioactive decay rate and gamma-ray intensity for 235,238U. These fractions in uranium isotopic were discussed and here we assume a tool for correction and normalization. It can be concluded that the 235U/238U ratio and 235Uconcentration can be varied naturally with a slight deviation. The difference and reliability of 235,238U isotope on experimental results of uranium mines depend on several reasons such as decay rate of natural uranium, Spontaneous fission half-life and Gamma-ray intensity for 235,238U. Therefore, the experimental results for 235U are very accurate than the calculated results to improve the isotopes of U and 235U/238U ratio in Uranium mines.