Tapered Radiation Shield for Portable XRF Safety
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Solution Overview
Problem
Portable XRF instruments face challenges in preventing exposure to dangerous levels of ambient radiation, particularly in stringent regulatory environments like Europe, where existing shielding within the instruments cannot ensure safety levels, especially for scattered radiation that does not intersect with the nose of the instrument.
Innovation Solution
A tapered radiation shield with a platen of attenuating material, such as tungsten embedded in a polymer matrix, is coupled to the XRF instrument, providing additional shielding to prevent multiple scattered x-rays from exceeding regulatory limits by varying in thickness with radius, minimizing weight and optimizing absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding material is added to the instrument to reduce radiation exposure, then radiation safety is improved, but the instrument weight increases
Solution Approach 1:
The collar provides localized radiation shielding around the x-ray source and exit port area, concentrating attenuation material where it is most needed rather than enclosing the entire instrument. This targeted approach reduces radiation exposure at critical locations while minimizing overall weight compared to complete shielding.
Solution Approach 2:
The collar utilizes composite construction with an inner layer of high-Z attenuating material (such as tungsten or lead) embedded in a polymer matrix, combined with an outer elastomer layer. This composite structure provides effective radiation attenuation while maintaining flexibility and reducing weight compared to solid metal shielding.
2Object-affected harmful factors
If thicker shielding is used to block scattered radiation, then radiation safety is improved, but the device complexity increases
Solution Approach 1:
The radiation shielding is divided into distinct functional layers: an inner layer of high-Z attenuating material for primary radiation blocking, and an outer elastomer layer for structural protection and flexibility. This segmentation allows each layer to be optimized for its specific function while simplifying the overall design compared to a monolithic shielding structure.
Solution Approach 2:
The elastomer outer layer acts as an intermediary between the rigid attenuating material and the external environment, providing mechanical protection, flexibility, and ease of attachment to the instrument while the inner attenuating layer handles the radiation shielding function.
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 solution effectively reduces ambient radiation exposure to safe levels, meeting stringent regulatory requirements by efficiently absorbing scattered x-rays, even at higher x-ray energies, while maintaining a lightweight and flexible design for ease of use.
Implementation Method 1
a tapered radiation shield with a platen of attenuating material, such as tungsten embedded in a polymer matrix, is coupled to the XRF instrument, providing additional shielding to prevent multiple scattered x-rays from exceeding regulatory limits
Data Source
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AI summary
An instrument and method for measuring the elemental composition of a test material. The instrument has a source of penetrating radiation for irradiating an irradiated region of the test material, a detector for detecting fluorescence emission by the test material and for generating a detector signal, and a controller for converting the detector signal into a spectrum characterizing the composition of the test material. A platen of attenuating material extends outward from adjacent to, and surrounding, the irradiated surface of the test material. In certain embodiments, the thickness of the attenuating platen is tapered such as to decrease with increasing radial distance from the central irradiated region of the test material.