Scintillator Column Layout for Low-Energy Radiation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radiation detection methods, such as liquid scintillation and solid scintillator technologies, struggle to accurately measure low-energy radioactive substances like tritium due to high attenuation and inefficiencies in light transmission, limiting sample volume and requiring prolonged measurement times.
Innovation Solution
A radiation detection apparatus utilizing a scintillator column with a support member that holds multiple longitudinal solid scintillators with small gaps, allowing light confinement and efficient transmission to photodetectors for precise detection of low-energy radioactive substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If plate-like solid scintillators are arranged in parallel with each other, then the device structure is simplified, but detection precision deteriorates due to large attenuation of low-energy beta rays in the thickness direction
Solution Approach 1:
The invention transitions from detecting beta rays in the thickness direction (one dimension) to detecting them in the length direction of longitudinal scintillators (another dimension). By arranging scintillators longitudinally and detecting light at both ends, the system achieves high detection precision without requiring beta rays to penetrate through thick material, thus resolving the contradiction between structural simplicity and detection precision.
2Volume of moving object
If plastic scintillator films are adhered on transparent round bars, then the device is compact, but detection precision deteriorates due to large attenuation of light in the length direction and insufficient photon generation
Solution Approach 1:
The invention extracts the scintillation function from thin films adhered on bars and implements it using solid scintillator materials that inherently confine and transmit light efficiently. By removing the problematic film-bar structure and using solid scintillators with appropriate optical properties, the system achieves both compactness and high detection precision through direct light confinement within the scintillator volume.
3Measurement precision
If liquid scintillators are mixed into liquid samples, then low-energy beta rays can be detected, but sample volume is limited and continuous measurement becomes difficult
Solution Approach 1:
The invention uses solid scintillators as an intermediary between the beta rays and the photodetector, eliminating the need for liquid scintillators mixed with the sample. The solid scintillators are positioned to face the liquid sample, allowing beta rays to interact with the scintillator surface or near-surface region, thereby enabling continuous flow measurement without contamination or volume limitations.
4Measurement precision
If optical fibers doped with scintillation substance are used, then radiation can be detected, but liquid samples cannot pass between the fibers
Solution Approach 1:
Instead of immersing scintillating optical fibers in the liquid sample (fibers inside liquid), the invention inverts the arrangement by positioning solid scintillators outside the liquid flow path and having them face the liquid sample. This allows the liquid to flow freely while beta rays emitted from the liquid interact with the external scintillators, resolving the contradiction between detection capability and sample flow capability.
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 high-precision detection of low-energy radioactive substances like tritium with reduced attenuation, allowing for continuous measurement without the need for liquid scintillators and improving detection efficiency.
Implementation Method 1
each of the plurality of solid scintillators emits light in response to contact with the radioactive substance contained in the test sample
Implementation Method 2
confines the light inside and leads the light to the both ends in a longitudinal direction
Implementation Method 3
a first photodetector arranged outside a test path in a position opposite to one end portion of each of the solid scintillators; and a second photodetector arranged outside the test path in a position opposite to another end portion of each of the solid scintillators
Data Source
Figure 1(A)~2
Figure 3~5(B)
Figure 6~7
AI summary
A radiation detection apparatus detects trace amounts of radioactive substance, and comprises a scintillator column and a photodetector. The scintillator column includes a plurality of bar-like solid scintillators and a support member that fixedly supports respective solid scintillators, and is arranged within a test path. The support member supports both end portions of the plurality of solid scintillators so that the plurality of solid scintillators are in a predetermined arrangement relationship where the plurality of solid scintillators are separated from each other with small gaps through which a test sample can pass. The solid scintillator emits faint light in response to contact with the radioactive substance when the test sample passes while contacting to circumferential surface, and confines the light inside and leads the light to both end portions. A plurality of photomultipliers are arranged outside the test path at positions opposite to the both end portions to detect the light.