Electromagnetic radiation is used in modern medicine for diagnosing diseases, treating certain medical conditions, and supporting specialized healthcare procedures. Doctors use different types of electromagnetic waves depending on whether the goal is medical imaging, cancer treatment, skin therapy, or another clinical application.
Common examples include X-rays for diagnostic imaging, gamma rays and high-energy X-rays for certain cancer treatments, radio waves for MRI scans, ultraviolet light for dermatological treatments, and visible light for specialized therapies.
Understanding the differences between ionizing and non-ionizing radiation is important because their medical applications, biological effects, and safety requirements vary.
Which Types of Electromagnetic Radiation Do Doctors Use?
Doctors use several types of electromagnetic radiation, including X-rays, gamma rays, radio waves, ultraviolet radiation, microwaves, infrared radiation, and visible light.
These forms of energy are used for different medical purposes, ranging from creating diagnostic images to delivering carefully controlled treatments.
Medical electromagnetic radiation is generally classified into two categories:
- Ionizing radiation: Includes X-rays and gamma rays, which have sufficient energy to remove electrons from atoms and molecules.
- Non-ionizing radiation: Includes radio waves, microwaves, infrared radiation, visible light, and commonly used medical ultraviolet wavelengths. These do not generally ionize atoms but can still cause biological effects depending on their intensity and exposure conditions.
The appropriate radiation protection measures depend on the technology, procedure, and expected exposure.
Ionizing Electromagnetic Radiation Used in Medicine
Ionizing electromagnetic radiation has enough energy to remove electrons from atoms and molecules. In medical settings, X-rays and gamma rays are used for specific diagnostic and therapeutic applications.
Although these technologies provide important medical benefits, exposure must be managed according to the clinical purpose and applicable radiation safety requirements.
X-Rays
X-rays are widely used in diagnostic imaging to examine bones, organs, and other internal structures.
Common applications include conventional radiography, computed tomography (CT), mammography, and fluoroscopy.
X-rays are also used in cancer treatment. Modern external-beam radiation therapy commonly uses high-energy X-ray photons directed toward tumors to damage cancer cells while limiting unnecessary exposure to surrounding healthy tissues.
The radiation dose and techniques used for diagnostic imaging differ substantially from those used in radiation therapy.
For a broader explanation of how X-rays interact with biological tissues, explore our guide to ionizing radiation and its effects.
Gamma Rays
Gamma rays are high-energy electromagnetic radiation associated with certain nuclear processes and radioactive materials.
In medicine, gamma radiation is used in selected cancer treatments, including Gamma Knife radiosurgery, which employs focused beams from cobalt-60 sources.
Gamma photons are also important in nuclear medicine imaging. In SPECT, detectors measure gamma photons emitted by radiopharmaceuticals. PET scanners detect photons generated when emitted positrons interact with electrons.
Because gamma radiation can penetrate tissue, appropriate shielding and radiation safety procedures are required based on the source and exposure conditions.
To understand the materials used for gamma radiation shielding, read our guide on what stops gamma radiation.
Non-Ionizing Electromagnetic Radiation Used in Medicine
Non-ionizing electromagnetic radiation generally does not have enough photon energy to remove electrons from atoms or molecules.
These forms of energy are used in medical imaging, therapeutic procedures, and specialized healthcare applications.
However, non-ionizing does not mean completely risk-free. Safety depends on the radiation source, intensity, exposure duration, and intended medical application.
Radio Waves and MRI
Radio waves are an important form of non-ionizing electromagnetic radiation used in magnetic resonance imaging (MRI).
MRI combines strong magnetic fields with radiofrequency pulses to generate detailed images of internal tissues and organs.
Unlike X-rays and CT scans, MRI does not use ionizing radiation. However, MRI requires specific safety precautions because of strong magnetic fields, radiofrequency heating, and potential interactions with medical implants or metallic objects.
According to the FDA’s MRI guidance, radio waves and magnetic fields work together to produce diagnostic images.
Ultraviolet (UV) Radiation
Ultraviolet radiation is used in selected dermatological treatments and healthcare disinfection applications.
Controlled UVB phototherapy is used to treat certain skin conditions, including psoriasis, eczema, and vitiligo, under medical supervision.
UV-C radiation is also used in properly designed germicidal systems to help inactivate microorganisms on suitable surfaces or in air.
UV-C disinfection should not be considered a universal replacement for validated medical instrument sterilization procedures.
Although commonly used medical UV wavelengths are classified as non-ionizing, excessive exposure can damage skin and eyes. Appropriate protective measures remain necessary.
Microondas
Microwaves are non-ionizing electromagnetic radiation used in certain therapeutic procedures.
For example, microwave ablation uses carefully controlled thermal energy to destroy targeted tissue in selected medical treatments.
Microwave energy may also be used in specialized heating applications. Its safety and effectiveness depend on the equipment, procedure, and controlled delivery of energy.
Infrared Radiation
Infrared radiation is associated with the transfer of heat and is used in some therapeutic heating applications.
Controlled infrared devices may be used for localized warming and other specific medical or rehabilitation purposes.
However, infrared treatments should not be described as universally effective for treating inflammation or diagnosing medical conditions.
Their clinical usefulness depends on the particular device and application.
Visible Light
Visible light is widely used in healthcare for medical examinations, endoscopy, and specialized treatment applications.
One important example is phototherapy for newborn jaundice, where appropriately selected blue-spectrum light helps reduce bilirubin levels.
Visible light is also used in certain specialized imaging and light-based medical procedures.
As with other medical technologies, the wavelength, intensity, and exposure conditions must be appropriate for the intended application.
Safety Considerations for Patients and Practitioners
Medical radiation protection depends on the type of electromagnetic radiation involved and how it is used.
For X-ray and gamma-ray procedures, healthcare facilities follow established radiation safety practices to manage exposure. These include clinically justified imaging, appropriate equipment settings, minimizing unnecessary exposure time, maintaining distance, and using suitable shielding.
For non-ionizing technologies, different precautions may be required. For example, MRI requires magnetic field safety procedures, while UV equipment requires protection against potentially harmful skin and eye exposure.
Radiation Protection Equipment for Medical Professionals
Healthcare professionals working around fluoroscopy, interventional radiology, and other X-ray-producing equipment may require protective equipment appropriate to their occupational exposure.
Common examples include:
- Lead Aprons: Help reduce scattered X-ray exposure to covered areas of the torso and pelvis.
- Thyroid Shields: Help protect the covered neck and thyroid region against scattered X-rays during appropriate procedures.
- Radiation Protection Gloves: May reduce hand exposure to scattered radiation when properly selected and used. Hands should remain outside the primary X-ray beam.
- Leaded Glasses: Help reduce occupational radiation exposure to the eye lens, particularly during relevant fluoroscopic procedures.
- Mobile Radiation Shields: Provide additional barriers against scattered X-rays when correctly positioned.
Protective equipment should complement established radiation safety procedures rather than replace them.
The appropriate equipment depends on the radiation source, shielding performance, expected exposure conditions, and facility requirements. Standard X-ray protective garments should not be assumed to provide adequate protection against every radiation hazard.
Conclusion: How Doctors Use Electromagnetic Radiation
Doctors use different types of electromagnetic radiation for medical imaging, cancer treatment, dermatology, and specialized clinical procedures.
X-rays and gamma rays are ionizing radiation used in selected diagnostic and therapeutic applications, while radio waves, ultraviolet radiation, microwaves, infrared radiation, and visible light serve other important medical purposes.
Understanding these differences helps healthcare professionals select appropriate imaging technologies, treatments, and radiation safety measures.
At Barrier Technologies, we manufacture radiation protection equipment designed to help medical professionals reduce unnecessary occupational exposure to scattered X-rays.
To explore suitable protective apparel and shielding solutions for your healthcare facility, contact Barrier Technologies.
