Ethan Clarke
Whether plastic shows up on X-rays is a frequently asked question, and the answer is not straightforward. The visibility of plastic on X-rays depends on its density and thickness. Dense plastics are more likely to show up on X-rays, whereas lightweight, thin, or flimsy plastics usually do not. Advanced X-ray systems, such as triple beam architecture and MDX technology, improve the detectability of plastics by simplifying X-ray imagery and identifying materials by atomic number rather than density. In the medical field, it is essential to distinguish between surgical tools and surrounding tissue, so some plastics have been designed to be more opaque and visible on X-rays. The ability to detect plastic contaminants is also crucial in the food industry to ensure product safety.
| Characteristics | Values |
|---|---|
| Plastics detectable by X-ray | Depends on the type of plastic, its density and thickness |
| Plastics detectable by advanced X-ray systems | Polyethylene, LDPE (low-density polyethylene) |
| Plastics not detectable by X-ray | Engineering plastics, lightweight and flimsy/thin plastics |
| Plastics detectable by MDX technology | Polyethylene, LDPE (low-density polyethylene) |
| Medical-grade plastics with good visibility and radiography | TECAPEEK MT XRO (PEEK), TECASON P MT XRO (PPSU) |
| Medical-grade plastics with improved performance | TECASON P MT black |
| Plastics detectable by in-line X-ray detection systems | TECAFORM AH UD blue (POM), HYDEX 4101 UD blue (PBT), TECAPEEK UD blue (PEEK) |
| Commonly ingested plastics detectable by X-ray | Plastic bead, plastic ring, plastic army figure, plastic triangle toy |
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What You'll Learn
Plastic contamination
The issue of plastic contamination is not limited to solid waste; microplastics, or tiny plastic particles, have been detected in various environmental niches, from Mount Everest to the deepest oceans. These microplastics can be ingested by animals, mistaking them for food, and can also clog drainage systems, leading to flooding in low-lying areas. Plastic pollution has altered habitats and natural processes, reduced ecosystems' ability to adapt to climate change, and directly impacted millions of people's livelihoods, food production capabilities, and social well-being.
X-ray technology has been employed to detect plastic contamination in food and manufacturing industries. While conventional X-ray systems may struggle to detect plastics due to their low density, advanced X-ray systems, such as Material Discrimination X-ray (MDX) technology, have been developed to improve detection capabilities. These advanced systems use techniques like triple beam architecture to eliminate blind spots and can identify materials by their atomic number rather than density.
In the healthcare industry, the detection of plastic contaminants is crucial, especially in cases of foreign body ingestion, which is common among children. While radiologists may face challenges in identifying non-metallic foreign objects through X-rays, advancements in X-ray detectable plastics, such as those designed for medical applications, have improved visibility during radiographic procedures.
To address the systemic issue of plastic pollution, a transition towards a circular economy is necessary. This involves reducing the use of single-use plastics, improving recycling practices, and implementing stricter laws and global treaties to mitigate plastic waste and its harmful effects on the environment and human health.
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X-ray detection technology
Advanced X-ray systems, such as triple beam architecture, can improve the detectability of plastics by eliminating blind spots. Additionally, software algorithms are becoming smarter and can now recognize specific characteristics present in low-density plastics. To increase the odds of plastic detection, some manufacturers have turned to using materials that are more X-ray detectable than regular plastics.
X-ray detectable plastics are used for various instruments and trial sizes where clear visibility of components is advantageous. For example, in the medical industry, X-ray detectable plastics can provide surgeons with a precise picture of their instruments and implants during image-controlled procedures. In the food industry, X-ray technology is used as a reliable method for detecting foreign objects during food quality inspection.
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Medical-grade plastics
The versatility of medical-grade plastics is another advantage, as they can be moulded into various shapes and sizes, making them suitable for a wide range of medical applications. They are also cost-effective, as they are usually cheaper than other options like metals or glass, and they are recyclable, making them environmentally sustainable.
In terms of X-ray detection, standard X-ray systems typically detect items with a higher density level than water, which means that some low-density materials, including plastics, can be difficult to detect. However, advanced X-ray systems, such as triple beam architecture and Material Discrimination X-ray (MDX) technology, have improved the detectability of plastics. Additionally, some medical-grade plastics, such as TECAPEEK MT XRO (PEEK) and TECASON P MT XRO (PPSU), have been designed with additives that make them more visible under X-ray and fluoroscopic radiation, providing healthcare professionals with precise imaging.
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Food industry applications
X-ray inspection systems are used in the food industry to detect contaminants within food and pharmaceutical products. X-ray inspection systems can detect all metals and other contaminants such as bone, ceramic, glass, and dense plastics. The orientation of the plastic within the product impacts the ease of detection. If the plastic contaminant is in a horizontal orientation, it will absorb fewer X-rays due to its density and will not be detected.
X-ray inspection systems can also be used to detect desirable plastic components such as plastic utensils in ready-to-eat meals. In such cases, food producers want to detect that the product has a certain plastic component inside the packaging.
Advanced X-ray systems, such as triple beam architecture, can improve the detectability of plastics. This works by splitting the ray into three beams to eliminate blind spots. Other systems, like MDX, reclassify x-ray imaging using atomic numbers. Software algorithms are also becoming smarter and can help recognize specific characteristics present in low-density plastics like polyethylene and LDPE (low-density polyethylene).
To increase the odds of plastic detection, some specialty manufacturers have turned to using materials that are more X-ray detectable than regular plastics. For example, Ensinger's Ultra Detectable family of engineering plastics can be picked up by typical in-line x-ray detection systems that are being deployed in food production facilities for quality inspection purposes.
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Density and thickness
The detectability of plastic by X-ray technology depends on its density and thickness. Plastic is a low-density type of packaging, which simplifies the inspection process with X-ray machines. However, some low-density plastics don't show up on X-ray imaging, while thicker plastics do. The X-ray machine's software requires settings that account for the varying thicknesses and densities of the plastic in use. The energy of the X-ray beam decreases based on the density of the packaging in use, so accounting for the thickness of the plastic packaging is essential for accurate results.
The density and composition of the object determine how much of the X-ray is absorbed. As the X-ray passes through the package, shadows are cast based on different densities. These shadows are then captured by a detector array, which renders a 2D representation of the object. Therefore, the detectability of plastics can be improved by using advanced X-ray systems that eliminate blind spots. For example, triple-beam architecture splits the X-ray into three beams to eliminate blind spots and increase the odds of detection.
The type of plastic also determines its detectability by X-ray technology. Most plastics have a density close to that of water (1000 kg/m3), which is the minimum density level that can be detected by standard X-ray systems. Polyethylene (PET) has a density of 750 kg/m3, low-density polyethylene (LDPE) has a density of 920 kg/m3, and high-density polyethylene (HDPE) has a density of 950 kg/m3. Some plastics have higher densities, such as PTFE (Teflon) at 2200 kg/m3 and Viton at 1800 kg/m3. Plastics with densities similar to water, such as HDPE, UHMW, and LDPE, are more challenging to detect.
To enhance the detectability of plastic contaminants, manufacturers have introduced X-ray-detectable plastics like Sustarin C® and Polystone®. Additionally, some manufacturers have started using materials with higher X-ray detectability than regular plastics. For example, Ensinger's Ultra Detectable family of engineering plastics can be detected by typical in-line X-ray detection systems used in food production facilities.
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Frequently asked questions
Plastic can show up on X-rays, but it depends on the type of plastic and the technology used. Dense plastics are more likely to show up, whereas lightweight, thin plastics usually don't. Advanced X-ray systems, such as MDX technology, improve the detectability of plastics.
MDX (Material Discrimination X-ray) technology identifies materials by atomic number rather than density. This allows for the detection of foreign objects that were previously undetectable through conventional X-rays, including some plastics.
Yes, some plastics are designed with added contrast mediums to provide clear visibility under X-ray radiation. These X-ray detectable plastics are used in medical and food industry applications, where it is important to distinguish between different materials and objects.
