## 5 Conclusions  
This study proposes a uranium quantification method based on correcting natural \(\gamma\)-ray total logging using prompt neutron time spectrum logging. Specifically, the approach integrates natural \(\gamma\)-ray total logging with prompt neutron time spectrum logging to establish a combination logging methodology. It derives the calculation methods for the calibration parameters, including the conversion coefficient \(A_{k}\) and background response \(B_{k}\), as well as the method for determining the uranium-radium-radon balance coefficient \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Standardized Model Wells**} & \multirow{2}{*}{**Uranium or Radium**} & \multirow{2}{*}{**Nominal Content (\(10^{-4}\) eU)**} & \multirow{2}{*}{**Measurement Count Rates (cps)**} & \multirow{2}{*}{**Interpretation Results (\(10^{-4}\) eU)**} & \multirow{2}{*}{**Absolute Error (\(10^{-4}\) eU)**} & \multirow{2}{*}{**Relative Error (\%)**} \\  & & & & & & \\ \hline \multirow{2}{*}{NU-1} & Uranium & 2.81 & / & 2.84 & 0.03 & 1.07 \\  & Radium & 2.44 & 716.93 & 2.47 & 0.03 & 1.23 \\ \hline \multirow{2}{*}{NU-2} & Uranium & 6.85 & / & 6.96 & 0.11 & 1.61 \\  & Radium & 6.29 & 1786.47 & 6.41 & 0.12 & 1.91 \\ \hline \hline \end{tabular}  
* Balance coefficient \(K_{p}=\mathrm{radium\ content/uranium\ content}\), \(K_{p}\) is 0.87 and 0.92, respectively, from NU-1 and NU-2.  
\end{table} 
Table 3: Uranium/radium quantitative interpretation results of natural \(\gamma\)-ray total logging from the standardized model well *. for the entire uranium-bearing layer. Subsequently, the radium content at each measurement point within the ore interval is obtained by inversion using the forward equation of natural \(\gamma\)-ray total logging for uranium quantification. Based on the uranium-radium-radon balance coefficient of the entire uranium-bearing layer, the radium content at each measurement point is corrected to obtain the true uranium content. In this study, the background response \(B_{k}\) was derived from a standardized zero-value model well (No. NB-4), and the conversion coefficient \(A_{k}\) was determined using a disequilibrium uranium-series standardized uranium model well (No. NU-3). These calibration parameters were applied to calculate the uranium content in two disequilibrium uranium-series standardized uranium model wells (Nos. NU-1 and NU-2). The experimental results demonstrate that the absolute error of the true uranium content is within \(\pm\)0.002% eU, and the relative error is within \(\pm\)2.5%. Compared to prompt neutron time spectrum logging, the proposed method can improve the logging speed while achieving results that are basically consistent with those obtained by the traditional natural \(\gamma\)-ray total logging method, thereby validating the feasibility of the proposed uranium quantification interpretation method and calibration parameters. The primary advantages of the uranium quantification method presented in this study are that it eliminates the need for core sampling and chemical analysis, thereby overcoming the \"three kinds of shortcomings\" associated with core-based chemical assays. At the same time, it addresses the low efficiency and high costs caused by the low count rates of prompt neutron time spectrum logging. Consequently, this approach enables prompt neutron time spectrum logging to serve as an auxiliary uranium quantification method in uranium exploration and extraction--particularly for in situ leach mining. The uranium quantification method proposed in this study has so far only been validated in sandstone-type standard model wells, without fully accounting for the various challenges encountered in real-world uranium exploration. In future work, this method will be extended to hard-rock-type uranium deposits and more diverse geological settings, accompanied by validation through actual uranium exploration practices. Conceptualization, Y.Z. and B.T. ; methodology, R.C. ; software, J.Q. ; validation, S.Z. and Z.L. ; formal analysis, H.W. and R.W.