Pulse Ionization Chamber for Sediment 224Ra Analysis
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Solution Overview
Problem
The conventional RaDeCC method for determining 224Ra in sediments requires helium gas and a power supply, making it unsuitable for remote study sites without access to these resources.
Innovation Solution
A method using a pulse ionization chamber (PIC) emanometer to determine 224Ra in sediments, which does not require helium gas, and involves dual counting to separate the 220Rn activity from total radon counts, allowing for on-site measurements with low cost and high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RaDeCC method is used to determine 224Ra in sediments, then measurement accuracy is improved (±5%-7%), but the device complexity and operational requirements increase due to the need for helium gas and power supply
Solution Approach 1:
The patent replaces the expensive and complex RaDeCC system with a simple, portable pulse ionization chamber that uses air instead of helium. The chamber is a disposable or single-use component that can be easily deployed and discarded, eliminating the need for expensive gas cylinders and complex electronic systems while maintaining adequate measurement accuracy for field applications.
Solution Approach 2:
The pulse ionization chamber uses the ambient air as the counting medium, eliminating the need for external helium supply. The system is self-contained and can operate independently without requiring power supply infrastructure, making it suitable for remote field measurements where complex equipment cannot be supported.
2Measurement precision
If the RaDeCC method is used to determine 224Ra in sediments, then measurement accuracy is improved (±5%-7%), but the ease of operation deteriorates due to the need for helium gas cylinders and power supply infrastructure
Solution Approach 1:
The patent employs a simple, portable pulse ionization chamber that requires no complex setup or infrastructure. The device is lightweight, easy to transport, and can be operated by simple personnel in remote field conditions without requiring power supply or helium gas infrastructure, dramatically improving ease of operation.
Solution Approach 2:
The system uses ambient air as the counting medium, eliminating the need for external gas supply. The chamber is self-contained and requires no power supply infrastructure, making it truly portable and easy to deploy in remote locations where complex equipment cannot be supported.
3Measurement precision
If the RaDeCC method is used to determine 224Ra in sediments, then measurement accuracy is improved (±5%-7%), but the testing cost increases due to the requirement of helium gas and complex equipment
Solution Approach 1:
The patent replaces expensive RaDeCC equipment with a simple, inexpensive pulse ionization chamber that can be manufactured at low cost. The use of ambient air instead of helium gas eliminates ongoing gas supply costs, making the testing process economically viable for routine field measurements and large-scale studies.
Solution Approach 2:
The system eliminates the need for expensive helium gas cylinders and complex electronic equipment. By using ambient air as the counting medium and requiring no power supply infrastructure, the overall testing cost is dramatically reduced while maintaining adequate measurement accuracy for field applications.
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
The method achieves accurate and efficient determination of 224Ra activity in sediments without the need for helium or a power supply, making it suitable for remote sites and reducing measurement costs.
Implementation Method 1
a pulse ionization chamber (PIC) emanometer... performing a first continuous measurement for an activity of Rn in the test system... performing a second continuous measurement for an activity of Rn in the pulse ionization chamber emanometer
Implementation Method 2
turning on the air pump and circulating gas in the test system for at least 5 minutes, such that a radioactive equilibrium between 220Rn gas released from the sediment standard sample and 224Ra in the sediment standard sample is reached
Implementation Method 3
an air flow rate provide by the air pump is 0.5-3 L/min
Data Source
AI summary
Disclosed is a method for determining 224Ra in a sediment by using a pulse ionization chamber emanometer, which belongs to the technical field of analysis and measurement. A pulse ionization chamber emanometer (PIC), a new emanometer, is used. Based on the half-life characteristics of different radon isotopes, one can separate the 220Rn activity from the total counts by dual counting. The resulting 220Rn measurement then can be used to determine the 224Ra activity in sediment according to the principle of secular radioactive equilibrium.