Air Ionization Chamber Gamma Dose Measurement in Neutron Therapy
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Solution Overview
Problem
Existing gamma-ray dose measurement methods for neutron capture therapy are complex and require facilities for gas-filled ionization chambers, increasing manpower and complicating the measurement process.
Innovation Solution
A measuring device and system that utilizes an ionization chamber filled with air to measure gamma-ray doses, using neutron counts to remove neutron-ray influence and calculate gamma-ray doses based on ionization amounts in the chamber, allowing for simplified and accurate dose measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas-filled ionization chambers are used for gamma-ray dose measurement, then measurement accuracy is improved, but device complexity and manpower requirements increase
Solution Approach 1:
The patent uses air (readily available in the environment) as the filling gas for the ionization chamber, eliminating the need for external gas supply facilities. The air itself serves the measurement function, making the system self-sufficient and reducing complexity while maintaining measurement capability
Solution Approach 2:
The patent extracts and removes the complex gas supply infrastructure from the measurement system. By using ambient air instead of requiring specialized gas-filled chambers, it eliminates the need for gas storage, supply lines, and associated control systems, thereby simplifying the overall device
2Measurement precision
If gas supply facilities are installed for ionization chambers, then measurement capability is improved, but ease of operation deteriorates
Solution Approach 1:
The ionization chamber uses ambient air automatically available in the environment, requiring no manual gas filling or supply operations. The system operates autonomously without user intervention for gas management, greatly simplifying the measurement process
3Loss of information
If neutron ray influence is not removed, then measurement completeness is improved, but measurement precision deteriorates
Solution Approach 1:
The patent segments the total radiation measurement into two separate components: neutron ray measurement and gamma ray measurement. By using an ionization chamber for total dose and a neutron detector for neutron component, the system can mathematically separate and accurately determine the gamma ray dose contribution
Solution Approach 2:
The patent employs a feedback mechanism where the neutron detector provides neutron ray information that is fed back to the controller. The controller uses this feedback to subtract the neutron contribution from the total ionization chamber reading, thereby isolating and accurately determining the gamma ray dose
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and accurate measurement of gamma-ray doses without additional gas facilities, facilitating efficient dose control in neutron capture therapy systems.
Implementation Method 1
an ionization chamber where air is contained and a measurement value relating to radiation including a neutron ray and a gamma ray is measured
Implementation Method 2
a detector that detects a detection value relating to the neutron ray
Data Source
AI summary
A measuring device includes an ionization chamber where air is contained and a measurement value relating to radiation including a neutron ray and a gamma ray is measured, a detector that detects a detection value relating to the neutron ray, and a controller that calculates a dose of the gamma ray based on the measurement value measured in the ionization chamber and the detection value detected by the detector.