Hematite Shielding Bricks for Gamma and X-ray Protection
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Solution Overview
Problem
Current radiation shielding materials like lead, iron, and concrete face issues such as toxicity, low hardness, corrosion, and insufficient radiation shielding due to low density, making them unsuitable for long-term use in facilities requiring both radiation protection and resistance to magnetic fields.
Innovation Solution
A molded article made by press-molding hematite with a composition of 90% by mass or more into a predetermined shape and firing it to achieve a bulk density of 2.8 g/cm³ or higher, providing excellent radiation shielding, high strength, and magnetic field compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead is used as radiation shielding material, then radiation shielding effect is improved, but toxicity increases
Solution Approach 1:
The patent replaces expensive and toxic lead with hematite, which is abundant, inexpensive, and non-toxic. The molded articles made from hematite provide effective radiation shielding without the harmful effects of lead, achieving the same protective function with a safer, more sustainable material.
Solution Approach 2:
The patent changes the material parameter from lead to hematite, altering the chemical composition while maintaining the radiation shielding function. By adjusting the density and composition of hematite-based molded articles, the patent achieves effective radiation protection without toxicity.
2Reliability
If iron is used as radiation shielding material, then density is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent replaces iron with hematite, which has comparable density for radiation shielding but superior corrosion resistance. Hematite's chemical stability allows it to maintain its protective function in harsh environments without degrading, eliminating the need for frequent maintenance.
Solution Approach 2:
The patent changes the material from metallic iron to hematite oxide, altering the chemical state to improve corrosion resistance while maintaining density. This parameter change transforms the material from one that rusts to one that is chemically stable and resistant to degradation.
3Ease of manufacture
If concrete is used as radiation shielding material, then cost is reduced, but radiation shielding effect deteriorates due to low density
Solution Approach 1:
The patent creates composite molded articles by combining hematite with binders and other materials to achieve optimal density and structural properties. This composite approach maintains cost-effectiveness while significantly improving radiation shielding performance compared to ordinary concrete.
Solution Approach 2:
The patent changes the density parameter of the shielding material by using hematite-based molded articles with controlled porosity and composition. By adjusting the density of the molded articles to be higher than concrete but lower than lead, the patent achieves effective radiation shielding at a reasonable cost.
4Reliability
If ferrite is used to increase density for radiation shielding, then radiation shielding effect is improved, but magnetic field interference increases
Solution Approach 1:
The patent replaces ferrite with hematite, which provides similar density for radiation shielding but does not exhibit strong magnetic properties. This substitution eliminates magnetic field interference while maintaining radiation protection, making the material suitable for use near sensitive electronic equipment.
Solution Approach 2:
The patent changes the magnetic parameter of the material by selecting hematite over ferrite. Hematite has weak magnetic properties compared to ferrite, allowing the material to provide radiation shielding without creating significant magnetic fields that could interfere with nearby equipment.
5Reliability
If lead is used for radiation shielding, then radiation protection is improved, but mechanical strength deteriorates due to softness
Solution Approach 1:
The patent creates composite molded articles combining hematite with binders and reinforcing materials to achieve both radiation shielding and mechanical strength. The composite structure provides the density needed for radiation protection while the binder and formulation provide structural integrity and hardness.
Solution Approach 2:
The patent changes the mechanical parameters of the shielding material by using hematite-based molded articles with controlled porosity, density, and composition. By optimizing these parameters, the patent achieves materials that are both dense enough for radiation shielding and mechanically strong enough for structural 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 hematite-based molded article effectively shields gamma and X-rays, is chemically stable, non-toxic, and suitable for use in facilities with magnetic equipment, while being cost-effective and easy to recycle, with enhanced compression strength and designability.
Implementation Method 1
The molded article for structure construction effectively shields gamma and X-rays
Implementation Method 2
press-molding hematite with a composition of 90% by mass or more into a predetermined shape
Implementation Method 3
firing it to achieve a bulk density of 2.8 g/cm³ or higher
Data Source
AI summary
Provided are an inexpensive brick, etc., naturally exhibiting excellent radiation shielding effects, demonstrating high strength while being chemically stable and not including harmful substances, and also being suitable for use in facility in which devices affected by magnetic fields are installed. Manufactured are a brick, etc., for constructing a γ- shielding structure or constructing an X-ray shielding structure, in which a molding material including hematite in a ratio of at least 90% by mass is molded into a predetermined shape to obtain a molded article, and the molded article is fired, whereby the fired molded article is endowed with a bulk density of at least 2.8g/cm3, and the fired molded article is endowed with a residual magnetization of 1.0 A·m2·g-1 or less.