Tabular Silver Halide Core-Shell Structure for X-ray Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial X-ray photosensitive materials face challenges in achieving high sensitivity and high contrast while minimizing the amount of coated silver, which increases costs and processing time, and require rapid processing suitability.
Innovation Solution
An industrial X-ray photosensitive material with at least one silver halide emulsion layer on both sides of a transparent support, using tabular silver halide particles with an average thickness of less than 0.2 μm and an aspect ratio of more than 8, where the core does not contain Ir or Rh, and the shell contains Ir or Rh, allowing for reduced silver usage and faster processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of coated silver is increased to achieve high contrast, then the contrast is improved, but the cost increases and processing time becomes longer
Solution Approach 1:
The patent changes the physical and chemical parameters of the silver halide particles by creating a core-shell structure with specific thickness ratios. The shell thickness is controlled to be 0.03-0.15 μm with aspect ratios of 8-20, which fundamentally alters how the particles interact with radiation and develop, achieving high contrast with reduced silver content and faster processing times.
Solution Approach 2:
The patent employs a composite core-shell structure where the core contains different chemical compositions than the shell. This composite architecture allows the shell to provide enhanced sensitivity and contrast properties while the core provides structural stability, enabling reduced overall silver content without sacrificing performance.
2Reliability
If the amount of coated silver is increased to achieve high sensitivity, then the sensitivity is improved, but the cost increases
Solution Approach 1:
The patent modifies the physical parameters of silver halide particles by controlling shell thickness to 0.03-0.15 μm and aspect ratios to 8-20. These parameter changes create a structure with higher surface area to volume ratio, which enhances sensitivity per unit mass of silver, thereby reducing the total amount of silver needed while maintaining or improving sensitivity.
Solution Approach 2:
The patent transitions from considering only particle volume to considering particle surface area and thickness dimensions. By controlling the shell thickness and aspect ratio, the patent optimizes the surface area available for radiation interaction, achieving higher sensitivity with less silver material.
3Manufacturing precision
If the layers are softened to achieve high contrast, then the contrast is improved, but the processing time becomes longer
Solution Approach 1:
The patent changes the chemical composition parameters of the shell layer by incorporating specific compounds that enhance contrast without requiring extensive softening. The controlled shell thickness and composition create a structure that develops rapidly while maintaining high contrast, eliminating the trade-off between contrast and processing speed.
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 material achieves high sensitivity and contrast with a reduced amount of coated silver, enabling rapid development in under 3 minutes and 30 seconds with improved image density and surface uniformity, and reduces the need for replenishers.
Implementation Method 1
the metal foil subjected to irradiation with the radiation rays and a coated silver halide particle itself absorb the irradiation energy, and release a secondary electron beam or the like, which is finally used to expose the photosensitive material
Data Source
AI summary
An industrial X-ray photosensitive material including at least one silver halide emulsion layer on both sides of a transparent support, wherein the silver halide emulsion layer contains tabular silver halide particles having an average particle thickness of less than 0.2 μm and an aspect ratio of more than 8, a core of the particles which is a core having a volume of 1% or more and less than 3% of a particle volume does not contain Ir or Rh, and a shell of the particles which is a shell having a volume of 97% or more and less than 99% of a particle volume contains at least Ir or Rh. An industrial X-ray photosensitive material having rapid processing suitability, as well as high sensitivity and high contrast is provided.