What Is the Best Shielding Material for X-Rays?
Clinicians frequently hear about the importance of wearing proper shielding when performing X-rays and other procedures like interventional surgery using C-arm guided fluoroscopy. Popular protective garments to shield against radiation include lead aprons, thyroid shields, and glasses.
However, it’s common to wonder if lead is the best shielding material for X-rays or if other alternative materials are a better fit. We’ll cover the various shielding materials in this guide to help you determine the safest and most effective options.
What Is the Most Effective Shielding Material for X-Rays?
Lead is one of the most effective radiation-shielding materials to protect clinicians regularly exposed to scatter radiation emitted during X-rays. Protective garments like lead aprons and thyroid shields have been used for decades and have a large body of research showcasing their X-ray shielding effectiveness.
For example, a study from the Journal of Clinical Orthopedic Trauma showed that 0.5 mm lead aprons can attenuate up to 99% of scatter radiation. Additionally, a study from Spine found that a snug traditional lead thyroid shield could reduce radiation doses to the thyroid gland by approximately 8.5 times.
The study from the Journal of Clinical Orthopedic Trauma mentions that lead is an effective radiation-shielding material because of its high density. When X-rays or gamma rays encounter lead, it slows and absorbs them before they reach the wearer’s body.
While lead has a long history of use, alternative materials are gaining popularity. According to a study published in the Journal of Biomedical Physics and Engineering, common alternatives to lead shielding are:
Bismuth
Barium
Tin
Tungsten
Antimony
Each of these materials has a high density to attenuate radiation beams, similar to lead. Many are also lighter than lead and more environmentally friendly, making them easier to dispose of when a garment’s lifespan ends. Those benefits are why research on alternative materials is ongoing, and manufacturers are starting to provide more lead-free garments as an option.
What Material Blocks the Most Radiation?
When considering lead-free alternatives, it’s common to wonder if other heavy metals like bismuth and tungsten perform as well as traditional lead in medical environments.
A study from the European Journal of Radiology in July 2023 assessed the effectiveness of alternative radiation-blocking materials compared to traditional lead. Researchers found that lead-free aprons performed similarly at voltages below 90 kVp. However, traditional lead aprons performed slightly better at higher voltages above 90 kVp.
Therefore, lead-free protective garments are effective in low-intensity procedures, such as a quick X-ray. The study notes that the average lead-free apron is 20% lighter, so wearing lead-free aprons during some procedures can help reduce fatigue for medical staff members.
Alternatively, traditional lead would still be a better fit for higher-intensity procedures. For example, a study published in April 2024 showed that gastrointestinal endoscopy using a mobile C-arm often had equipment operating in voltage ranges of 90-120 kV.
It’s best to consult with your facility’s radiation safety officer to determine the proper protective garments for each procedure based on factors like intensity, duration, and proximity to the radiation source. You can also ask the manufacturer for their protective material performance information to determine which material works best.
What Material Can an X-Ray Not See Through?
X-rays have trouble capturing images through any materials that have a high density.
For example, the Mayo Clinic advises patients to avoid wearing jewelry and eyeglasses during X-rays. Furthermore, the CDC mentions that patients shouldn’t wear clothes with buttons, zippers, or buckles in the X-ray’s field of view. Many of those objects are made of metal or other dense materials that would cause artifacts (also called ghost images) that block key areas and reduce the image’s quality.
Since protective garments also have a high material density, a study from the Journal of Medical Imaging and Radiation Sciences recommends avoiding patient shielding during X-rays. The X-ray beams would have difficulty penetrating through materials like lead, impacting X-ray opacity and image clarity.
Additionally, a study in the British Journal of Radiology mentions a growing body of research showing that patient shielding during X-rays can be harmful. Modern X-rays use automatic controls to adjust exposure levels based on factors like the patient’s weight. Therefore, when a lead or other high-density material is in the field of view, the machine automatically increases the radiation dose to the whole room, which is dangerous for clinicians and patients.
However, shielding is still recommended for clinicians since they’re exposed to radiation much more often throughout the day and don’t get in the field of view of X-rays.
How RCS Can Help Manage Protective Garments
Protective garments like lead aprons and thyroid shields worn frequently by clinicians in radiology can accumulate wear, tear, dirt, germs, and contaminants during use. Therefore, proper maintenance is necessary to ensure they remain as safe and effective as possible.
A study published in Radiography Open mentioned that damage to protective garments, like cracks, holes, and tears, may reduce their effectiveness. We recommend annual inspections to detect defects and repair them early on.
Additionally, a study by Dr. Jaber found that 84% of lead aprons analyzed were contaminated with Tinea species (ringworm) and Staphylococcus aureus. Deep cleaning and disinfection are required to remove harmful contaminants like those and keep your staff and patients safe.
We can help with those aspects at Radiological Care Services (RCS). We offer deep cleaning and disinfection, annual inspections using X-ray scanning, garment repair, and garment disposal. Our RADCOMPLY™ inventory management software can also help you track maintenance schedules and manage data for compliance.
Contact us today to learn more about how RCS can help.