In January 2025, the USDA’s Food Safety and Inspection Service announced a recall of nearly 25,000 pounds of frozen chicken taquitos after a consumer found metal in their food. That same month, a separate alert warned of ground beef products contaminated with hard plastic and metal fragments.
These incidents highlight an uncomfortable reality for food manufacturers: foreign material contamination remains one of the most persistent threats to consumer safety and brand reputation.
For new food manufacturers evaluating inspection equipment, x-ray technology has become a preferred solution for detecting a wide range of foreign materials. But is it the right choice for your operation?
This guide explains the use of x-ray in the food industry, how x-ray food inspection works, what it can and cannot detect, and how to determine whether this technology belongs on your production line.
Primary Use of Food X-Rays
X-ray inspection excels at identifying foreign materials based on density contrast with the food product. Modern systems routinely detect metals of all types, including ferrous, non-ferrous, and stainless steel. This capability extends to products packaged in foil or metalized film, where metal detectors often struggle with interference.
Beyond metals, x-ray systems identify glass fragments, ceramic pieces, stones, minerals, and calcified bone. Dense plastics and rubber components from equipment seals or gaskets also appear clearly in x-ray images. For protein processors, specialized systems like the TDI Packsys Dual-Energy X-Ray Inspection System can detect thin chicken bones as small as 3mm and metals down to 0.3mm.
The range of detectable materials makes x-ray inspection particularly valuable for facilities handling multiple product types or those with diverse contamination risks. A single x-ray system can address concerns that would otherwise require multiple inspection technologies. For detailed information about detection capabilities, see our guide on what materials x-ray food inspection systems can detect.
Detection capability depends on the density difference between the foreign material and the surrounding product. Homogeneous products like butter, yogurt, or jelly provide excellent contrast for detection. Products with varying densities or random textures present more challenges, though dual-energy systems help address these situations by analyzing chemical composition rather than density alone.
Materials X-Ray Cannot Detect
No inspection technology detects everything. X-ray systems cannot reliably identify low-density materials including hair, paper, cardboard, fabric, string, wood, and insects. Low-density plastics and stones with minimal density contrast may also escape detection. Soft tissue like cartilage often falls below detection thresholds because its density closely matches meat products.
New manufacturers should understand a critical distinction: x-ray inspection detects foreign materials based on physical density. It does not identify chemical contamination, biological hazards, allergens, or pathogens. Those hazard categories require different food safety controls and testing methods.
How X-Ray Food Inspection Systems Work
X-ray inspection uses the same fundamental technology found in medical imaging, adapted specifically for food production environments. The systems direct invisible beams of electromagnetic radiation through products as they move along a conveyor belt.
As x-rays pass through food, their energy decreases based on the density of materials they encounter. Dense foreign materials like metal, glass, or bone absorb more x-ray energy than the surrounding food product. Internal sensors capture these energy differences and convert them into grayscale images. Areas of high density appear darker on the image, making potential foreign materials visible for analysis.
Modern systems process these images in real time using sophisticated software algorithms. When the system identifies a potential foreign material, it automatically triggers a rejection mechanism to remove the affected product from the line. Manufacturers can calibrate sensitivity settings and establish critical control points based on their specific products and quality requirements.
Unlike metal detectors that rely on electromagnetic field disruption, x-ray systems measure density differences. This distinction enables detection of non-metallic foreign materials that would pass undetected through conventional metal detection.
Beyond Detection: Quality Assurance Functions
X-ray systems perform multiple quality checks simultaneously, making them valuable for overall production quality beyond safety compliance. A single system can identify broken, crushed, or malformed products while counting internal components to verify multi-pack completeness.
Many systems include mass measurement capabilities. This x-weighing function identifies underweight or overweight packages without requiring a separate checkweigher on the line. Fill level verification confirms proper fill in bottles, jars, and containers.
For products like filled pastries, this capability ensures consistent filling levels where too much wastes money and too little generates customer complaints.
Package seal integrity inspection helps identify packaging defects before shipment. Combined with leak detection capabilities, these functions reduce waste and prevent quality issues from reaching consumers.
X-Ray Inspection vs. Metal Detection
Both technologies serve important roles in food safety programs, but they offer different capabilities. Understanding these differences helps manufacturers select the right equipment for their specific needs.
Metal detectors excel at finding ferrous, non-ferrous, and stainless steel contaminants. They work well with dry products and offer lower initial costs with longer equipment lifespans. However, wet, salty, or high-mineral foods create what industry professionals call “product effect,” which can cause false rejections or require reduced sensitivity settings.
X-ray systems detect all metal types plus glass, stone, bone, dense plastics, and rubber. They work reliably with products packaged in foil or metalized film and remain unaffected by product effect. The trade-off includes higher initial investment, greater power consumption, and periodic x-ray tube replacement.
For manufacturers processing products with high salt or moisture content, x-ray inspection often proves more practical. The same applies to finished products in metallic packaging like foil pouches or lined cartons. Facilities concerned primarily with metal contamination in dry goods may find metal detection sufficient for their needs.
Many manufacturers implement both technologies at different points in their production process. A common approach uses metal detection on incoming raw materials and x-ray inspection on finished products. This combined strategy provides comprehensive coverage across different contamination risks. For a detailed comparison, see our guide on x-ray machines versus metal detectors in food inspection.
Types of X-Ray Systems for Different Applications
Manufacturers produce x-ray inspection equipment in configurations suited to different products and production environments.
Single-energy systems use one energy spectrum for detection and work best with products of consistent density. The XR Standard X-Ray Inspection System from TDI Packsys handles both packaged and unpackaged products while maintaining production logs for traceability and compliance documentation.
Dual-energy systems employ two energy spectrums and analyze materials by chemical composition rather than density alone. This approach improves detection of challenging low-density foreign materials in complex products. Young chicken, bagged salads, mixed nuts, and cereals benefit from dual-energy inspection where conventional systems might struggle to distinguish foreign materials from product variations.
Large-format systems accommodate oversized products and bulk containers. The GP Bulk-Flow X-Ray Inspection Systems inspect bags of nuts, seeds, grains, and pet foods while simultaneously measuring contents by weight to identify overfilled or underfilled packages.
Application-specific configurations address particular industry challenges. Chicken bone detection systems provide optimized sensitivity for poultry processors where bone fragments represent a primary contamination concern.
Why Food Manufacturers Invest in X-Ray Inspection
Regulatory compliance drives many equipment decisions. The Food Safety Modernization Act (FSMA) emphasizes preventive controls, and x-ray inspection supports Hazard Analysis and Critical Control Points (HACCP) requirements by providing reliable detection at critical control points.
Systems that generate detailed production logs assist with audits and help manufacturers achieve certification under Global Food Safety Initiative (GFSI) recognized schemes including SQF, BRCGS, and IFS.
Major retailers increasingly mandate specific inspection technologies from their suppliers. Costco, for example, requires food suppliers to use x-ray inspection for finished products. Meeting these specifications opens access to significant market channels that might otherwise remain closed.
The financial case extends beyond compliance. Foreign material contamination causes recalls that damage brand reputation and consumer trust. According to USDA data analyzed by food safety researchers, foreign material contamination, including metal and plastic, triggered 12 food recalls in 2024 alone. Each recall involves direct costs for product retrieval and disposal plus indirect costs from lost sales and reputational damage.
X-ray systems create accountability through data logging and image storage. When contamination does occur, this documentation helps identify sources and enables targeted recalls that minimize scope and cost. The ability to save and review rejected product images supports continuous improvement efforts and helps identify recurring issues in production processes.
Multi-function capability also improves return on investment. A single x-ray system performing foreign material detection, mass measurement, fill verification, and component counting can replace multiple separate inspection stations. This consolidation reduces equipment footprint, simplifies maintenance, and streamlines operator training requirements.
Understanding the Limitations
Honest evaluation requires acknowledging what x-ray inspection cannot do. Beyond the detection limitations discussed earlier, cost considerations deserve attention.
Initial equipment investment exceeds metal detection systems. Operating costs run higher due to power consumption. X-ray tubes require periodic replacement, adding to lifecycle costs. Energy-efficient facility infrastructure can offset some utility expenses, but the total cost of ownership exceeds simpler detection technologies.
Proper calibration and operator training matter significantly. Systems that are improperly configured or operated by untrained personnel will underperform their capabilities. Professional guidance during implementation helps ensure optimal performance from the start. TDI Packsys provides commissioning support and operator training as part of our service commitment.
Before purchasing, request product validation testing with your actual products. Reputable suppliers test detection capabilities under realistic conditions to verify performance for your specific application. This step prevents expensive surprises after installation.
Is X-Ray Inspection Safe?
Safety concerns about radiation deserve direct answers. X-ray food inspection does not irradiate food in any meaningful sense. The radiation levels involved fall far below thresholds that would affect food safety, nutritional value, taste, or quality.
The FDA regulates cabinet x-ray systems under 21 CFR 1020.40, which limits radiation emissions to less than 0.5 milliroentgen per hour at five centimeters from the external surface. Modern systems operate well below this threshold.
For context, food inspection x-rays expose products to radiation doses millions of times lower than those used in food irradiation, which is an entirely different process designed to kill bacteria. The World Health Organization has confirmed that foods remain safe at radiation levels vastly exceeding what inspection systems produce.
Operator safety is addressed through equipment design. Cabinet systems include protective shielding, safety interlocks, and lead curtains that contain emissions. Workers operating properly maintained x-ray inspection equipment receive radiation exposure below levels encountered from natural background sources in daily life. Additional information on radiation safety appears in our article about the truth about food irradiation.
Evaluating X-Ray Inspection for Your Operation
New food manufacturers should approach equipment selection systematically. Start by assessing your risk profile. What foreign materials could realistically enter your products based on ingredients, equipment, and processes? What packaging formats do you use? What do your target retailers or certification bodies require?
Consider your product characteristics carefully. Density, consistency, packaging type, and production speed all influence equipment selection. Products with variable densities or complex textures may benefit from dual-energy systems despite higher costs. High-speed lines require systems capable of maintaining detection accuracy at faster throughput rates.
Production environment matters as well. Facilities processing raw meat or poultry need equipment rated for washdown cleaning procedures. Space constraints may favor compact system designs. Integration with existing conveyor systems and rejection mechanisms requires advance planning to avoid costly modifications during installation.
Evaluate total cost of ownership rather than purchase price alone. Factor in installation, integration with existing lines, operator training, ongoing calibration, power consumption, and maintenance requirements.
For food manufacturers uncertain about long-term needs, rental and lease options allow evaluation before full commitment. Our article on introducing new food inspection systems provides additional guidance for planning successful implementations.
Finding the Right Solution
X-ray food inspection provides detection capabilities that metal detection alone cannot match. For food manufacturers facing diverse contamination risks, regulatory requirements, or retailer mandates, this technology offers a proven path to improved food safety and quality assurance.
The right system depends on your specific products, production environment, and business requirements. TDI Packsys helps food manufacturers evaluate options, validate performance with actual products, and implement solutions matched to their needs. Our team provides consultation, installation support, operator training, and ongoing service to maximize equipment performance and uptime.
Contact TDI Packsys at 877-834-6750 to discuss your inspection requirements or view our complete range of x-ray inspection systems.
