Phosphor Storage Screen Epoxy Treatment for Iodine Yellowing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phosphor storage screens used in medical radiography undergo yellowing due to iodine oxidation, leading to unsightly appearance and compromised image quality during digitization, especially in dental applications where screens are exposed to UV light and humidity.
Innovation Solution
Treating phosphor screens with a gaseous epoxy compound, such as oxirane, during or after production to prevent iodine yellowing by allowing epoxy molecules to interact with phosphor particles, thereby forming a protective layer that inhibits iodine gas absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphor screens contain iodine for radiographic use, then the phosphor can store latent images effectively, but yellowing occurs due to iodine oxidation leading to poor image quality
Solution Approach 1:
An epoxy-containing compound is introduced as an intermediary substance between the iodine-containing phosphor and the environment. This compound reacts with iodine to form a protective layer that prevents iodine oxidation and subsequent yellowing, while allowing the phosphor to maintain its latent image storage function
Solution Approach 2:
The epoxy compound reacts with the potentially harmful iodine that causes yellowing, converting this harmful element into a stable complex. The reaction product forms a protective layer that actually benefits the screen by preventing further degradation while preserving the phosphor's imaging capabilities
2Adaptability or versatility
If screens are exposed to UV light and humidity for dental applications, then the screens can be used in various environments, but yellowing accelerates due to iodine oxidation
Solution Approach 1:
The epoxy compound is applied in advance to create a protective barrier against UV light and humidity. This preliminary action prevents the harmful interaction between environmental factors and iodine before oxidation can occur, thereby extending the screen's usable life in diverse environments
3Object-affected harmful factors
If epoxy compound is applied to phosphor screens, then yellowing is prevented, but additional processing steps are required
Solution Approach 1:
The epoxy-containing compound is applied during the phosphor screen production process itself, before the screen is put into service. This preliminary action ensures the protective function is built-in from the start, avoiding the need for separate post-production treatment steps
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
Prevents yellowing and maintains image quality by ensuring the epoxy compound effectively reacts with iodine, reducing the risk of iodine gas absorption and enhancing the stability and safety of the screens.
Implementation Method 1
a treatment with at least an epoxy group containing compound in gaseous form is applied to said phosphorous composition
Implementation Method 2
allowing epoxy molecules to interact with phosphor particles, thereby forming a protective layer that inhibits iodine gas absorption
Implementation Method 3
In the case of oxirane, it is thought that probably the triangle opens up and interacts with the surface of the phosphor particle
Implementation Method 4
a yellowing of the screens occur. The probable cause of this phenomenon is that iodine, present for e.g. 15 mol %, is available for oxidation at the surface of the grain and as a result is converted to iodine gas
Data Source
AI summary
The present invention concerns a method for the treatment of stimulable phosphors and/or screens for use in diagnosis, in particular medical radiography. The method comprises subjecting the stimulable phosphors and/or screens to an epoxide containing gaseous compound, promptly following their manufacture. By applying the method according to the invention yellowing of the stimulable phosphors and/or screens is prevented in a safe and efficient manner; thereby the disadvantages known as such resulting from such yellowing will not occur.