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Updated: Jan 7, 2026
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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Controllable X-ray density calibration: A safe replacement for Cs-137 radioactive source.
Jilin Fan1, Jiawei Zhang2, Qiong Zhang3
1University of Electronic Science and Technology of China, China; China National Logging Corporation, China.
Summary
This study replaces uncontrollable Cesium-137 (Cs-137) sources with controllable X-ray sources for formation density logging. A Monte Carlo simulation and conversion model demonstrate the feasibility and accuracy of this safer, more versatile alternative.
Area of Science:
- Geophysics
- Nuclear Well Logging
- Radiation Safety
Background:
- Traditional formation density logging relies on Cesium-137 (Cs-137) radioactive sources, posing challenges in control, radiation hazards, and application scope.
- The need for safer and more controllable logging technologies is critical for the oil and gas industry.
Purpose of the Study:
- To propose and validate a technical approach for replacing Cs-137 sources with controllable X-ray sources in formation density logging.
- To develop a conversion model for accurately translating density calibration formulas between Cs-137 and X-ray logging tools.
Main Methods:
- Utilizing Monte Carlo simulations to model X-ray logging tools and analyze energy spectrum characteristics.
- Establishing density calibration formulas for X-ray energies and source-detector spacings.
- Developing a composite functional relationship to link X-ray energy, spacing, and correlation coefficients.
- Inverse solving for equivalent X-ray parameters by matching Cs-137 calibration formula coefficients.
Main Results:
- The Monte Carlo simulation successfully modeled the X-ray logging tool and analyzed its energy spectrum.
- Optimal energy windows and density calibration formulas were determined for various X-ray conditions.
- A conversion model was established, achieving a calibration coefficient error of less than 1% across diverse lithologies.
- The study validated the accuracy and feasibility of using X-ray sources as a replacement for Cs-137.
Conclusions:
- The proposed X-ray based formation density logging offers a controllable, safer, and accurate alternative to traditional Cs-137 methods.
- The developed conversion model provides a robust theoretical foundation and engineering methodology for implementing radioactive source replacement technology.
- This advancement enhances radiation safety and expands the application scope of formation density logging tools.
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