Passive Tritium Sampling Device with Segmented Adsorbent
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Solution Overview
Problem
Current tritium sampling devices are either active and expensive, require frequent maintenance, or have limited sensitivity and sampling efficiency due to saturation issues with adsorbent materials, making them unsuitable for long-term monitoring of atmospheric tritium concentrations.
Innovation Solution
A passive tritium sampling device with a reservoir containing adsorbent material, such as zeolite beads, and a geometrically optimized membrane or cover with controlled communication openings to maintain a high gas exchange surface area, preventing saturation and ensuring linear sampling over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If adsorbent material is used in a passive sampling device, then the device does not require energy supply and is economical, but the adsorbent material quickly reaches saturation in surface layers, limiting sampling duration to 3-4 days
Solution Approach 1:
The adsorbent material is segmented into multiple layers with different properties. The first layer (closest to communication openings) has low affinity for water vapor to prevent premature saturation, while subsequent layers have progressively higher affinity, creating a staged absorption process that extends sampling duration beyond 3-4 days.
Solution Approach 2:
Different regions of the adsorbent material have different affinities for water vapor. The surface layers have modified properties (lower affinity) compared to deeper layers (higher affinity), allowing the device to maintain effectiveness throughout the sampling period by preventing saturation at the entry point while preserving high-capacity layers for later use.
2Ease of operation
If adsorbent material is used to trap tritium, then the device is passive and easy to deploy, but measurement precision decreases after saturation threshold is reached
Solution Approach 1:
The adsorbent material is divided into multiple layers with different affinities for water vapor. This segmentation prevents saturation in the surface layers, maintaining measurement precision throughout the sampling period and allowing accurate determination of average tritium activity over extended durations.
3Duration of action of moving object
If water vapor is condensed to recover tritium, then sampling can be done over short periods, but the device requires active energy input and complex setup
Solution Approach 1:
The device uses passive adsorption through strategically layered adsorbent materials that automatically capture water vapor containing tritium without requiring external energy input, pumps, or complex condensation systems. The multi-layer structure self-regulates the absorption process, extending sampling duration while maintaining simplicity.
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 device allows for accurate, long-term sampling of tritium concentrations (1-20 days) with sufficient tritiated water recovery for radiological analysis, avoiding saturation and maintaining measurement linearity, even under high humidity conditions.
Implementation Method 1
a cylinder of adsorbent material 32, suitable for removing tritium contained in the air by adsorption
Implementation Method 2
a membrane or a cover 130 attached to the reservoir 110, in which one or more communication openings 131 are formed, allowing fluid communication between the environment E and the reservoir 110
Data Source
AI summary
The invention relates to a device (100) for sampling tritium present in a gaseous environment (E), including: a vessel (110) in fluid communication with the gaseous environment, and a quantity of adsorbent material (120) arranged inside said vessel (110), suitable for adsorbing the tritium contained in the gaseous environment, the device including at least one opening (131) for fluid communication between the vessel and the gaseous environment, the device being characterized in that: the shape of the opening (131) for fluid communication is suitable for ensuring, depending on the duration of the sampling, that the quantity of adsorbent material is not saturated at the end of the sampling, and that the adsorbent material is shaped such as to have a rotationally symmetrical surface for exchange with the gaseous environment.