Radio frequency electromagnetic fields are produced by wireless communication devices and broadcast signals. They range from about 3 kHz to 300 GHz and include frequencies used by cell phones, WiFi, Bluetooth, and 5G. RF is typically measured in microwatts per square meter (µW/m²) or milliwatts per square centimeter (mW/cm²).
Based on Building Biology Institute guidelines (µW/m² (microwatts per square meter)):
See where common exposures fall on the scale:
Showing 736 studies with measured radio frequency (rf) exposure
Eric J. Lerner · 1984
This 1984 research examined the regulatory landscape for electromagnetic field exposure standards, focusing on occupational safety and public health protections. The study analyzed the policy drivers and challenges behind establishing EMF exposure limits during a period when awareness of potential health effects was growing.
Unknown authors · 1974
This 1974 Environmental Health Perspectives review examined microwave radiation's biological effects and health hazards, representing early scientific recognition of potential EMF risks. The research covered biophysical mechanisms and dosimetry methods for measuring microwave exposure. This work helped establish the foundation for modern EMF health research during a time when microwave technology was rapidly expanding.
Unknown authors · 1972
This 1972 journal article examined microwave radiation as a public health threat, focusing on cataract formation and other medical effects from exposure. The research contributed to early understanding of microwave radiation's biological impacts during a period when microwave technology was rapidly expanding in both military and civilian applications.
Unknown authors · 1972
The Massachusetts Department of Public Health conducted a survey in 1972 examining diathermy devices, which use microwave radiation for medical heating treatments. This early government investigation focused on radiation control and safety protocols for medical microwave equipment. The study represents one of the first official efforts to assess microwave radiation exposure risks in healthcare settings.
Ernest Jacobs et al. · 1961
This 1961 technical report examined methods for measuring power density from radiofrequency electromagnetic sources. The research focused on developing and comparing different measurement techniques across various frequency ranges. This foundational work helped establish standardized approaches for quantifying RF electromagnetic field exposures.
David E. Goldman · 1960
This 1960 conference paper examined short wave electromagnetic radiation as an occupational hazard for personnel, likely focusing on radar operators and military workers exposed to microwave frequencies. The research addressed biological effects of electromagnetic radiation exposure in workplace settings during the early radar era.
Frederic G. Hirsch · 1970
This 1970 case report examined a human patient who developed cataracts after microwave radiation exposure. The study represents an early documentation of microwave-induced eye damage, contributing to our understanding of how electromagnetic fields can affect vision and eye health.
R. I. GRAY, C. E. GALLAHER · 1971
This 1971 technical report examined methods for measuring electromagnetic field exposure from non-ionizing radiation sources to assess potential health hazards. The research focused on developing proper measurement techniques and survey instruments for evaluating biological effects from EMF exposure. This represents early recognition that electromagnetic fields posed measurable health risks requiring systematic assessment.
Walters TJ et al. · 1998
Scientists exposed rats to 2.06 GHz microwave radiation and measured brain temperatures. High-power microwaves created uneven heating patterns, with some brain areas heating 2-2.5 times faster than nearby regions. This uneven heating didn't occur with conventional heat sources like warm water.
Walters TJ, Blick DW, Johnson LR, Adair ER, Foster KR · 2000
Researchers exposed 10 volunteers to high-intensity millimeter wave radiation (94 GHz) for 3 seconds to determine when skin heating becomes painful. They found that pain occurred when skin temperature reached 43.9°C, representing a 9.9°C increase from baseline. The study was designed to help predict pain thresholds for military applications using millimeter wave technology.
Donald R. Belsher · 1975
NIOSH developed the EDM-2, a specialized instrument designed to measure electric energy density in near-field electromagnetic environments. This technical report documented the engineering and calibration of equipment used to quantify EMF exposures in workplace and environmental settings. The meter represents early efforts to create standardized tools for measuring electromagnetic field strength close to EMF sources.
Unknown authors
This Holaday Industries product brochure showcased microwave measurement instrumentation used to detect and quantify electromagnetic field exposure levels. The company specialized in RF and microwave detection equipment that became essential tools for researchers studying EMF health effects. These instruments helped establish the measurement standards still used today in EMF research.
Paul Brodeur · 1978
This 1978 analysis by Paul Brodeur examined how government agencies and industry responded to growing concerns about microwave radiation health effects by blaming media coverage rather than addressing the science. The review covered controversial cases including the Moscow Embassy microwave bombardment and PAVE PAWS radar systems, highlighting patterns of deflecting responsibility when health questions arose.
Unknown authors · 1962
This 1962 General Electric technical report focused on developing instrumentation to measure RF radiation hazards and assess personnel exposure to microwave radiation. The study addressed early concerns about workplace safety as microwave technology expanded in military and industrial applications. This represents foundational work in establishing methods to detect and quantify RF exposure risks.
Unknown authors · 1962
This 1962 General Electric technical report focused on developing instrumentation to measure RF radiation hazards (RADHAZ) at military installations. The research addressed the need for accurate power density measurements to assess potential health risks from radio frequency radiation exposure. This early work helped establish protocols for monitoring electromagnetic field exposure in military settings.
W. W. Salisbury, John W. Clark, H. M. Hines · 1948
This 1948 technical report by W.W. Salisbury examined physiological damage caused by microwave radiation exposure in animals. The research represents one of the earliest systematic investigations into the biological effects of microwave energy, conducted during the post-World War II period when radar technology raised initial safety concerns. This foundational work helped establish the scientific understanding that microwave radiation can cause measurable biological harm.
Gao XF,Pei LP, Chen CH, Yang XS, Zhang GB, Deng ZH, Yu ZP. · 2009
Researchers exposed rats to high-level microwave radiation for 20 minutes and found increased production of heat shock protein 70 in the brain's hippocampus. This protein signals cellular stress, indicating microwave radiation triggers the brain's defense mechanisms against potential damage.
Ellingsrud S, Johnsson A · 1993
Norwegian researchers exposed Telegraph plants to radio waves at 27.12 MHz and found the electromagnetic fields disrupted the plants' natural leaf movements, even at the lowest power tested. The timing and rhythm changes occurred without heating effects, showing living organisms can be sensitive to RF radiation.
Mario Simonelli, Vittorio Rizzini · 1952
This 1952 Italian study by Simonelli examined microwave radiation effects on animal eyes, specifically investigating lens damage and cataract formation. The research contributed early evidence that microwave exposure could cause eye injury, focusing on the crystalline lens structure. This work helped establish the eye as a particularly vulnerable organ to microwave radiation damage.
Frederic G. Hirsch, M. D. · 1969
This 1969 case report by Hirsch documented bilateral cataracts (affecting both eyes) in a patient exposed to microwave radiation. The study represents an early clinical observation linking microwave exposure to eye damage, contributing to our understanding of how electromagnetic fields can affect human vision.
Unknown authors
This technical report examined radiofrequency radiation exposure standards across different organizations including NATO, the USSR, USAF, and OSHA. The document analyzed how various military and occupational safety agencies set power density limits for RF radiation exposure. This type of comparative analysis reveals significant differences in how different nations and organizations approach RF safety.
Ulrich H. Behling · 1969
This 1969 government report by Ulrich Behling reviewed the biological effects of both radio frequency and low frequency electromagnetic radiation. The comprehensive analysis examined how nonionizing radiation affects living systems, representing early official recognition of potential EMF health impacts. This work helped establish the foundation for understanding electromagnetic field interactions with biological tissue.
Ulrich H. Behling · 1969
This 1969 technical report by Ulrich Behling examined the biological effects of both radio frequency and low frequency electromagnetic radiation on living systems. The study represents early research into how nonionizing electromagnetic fields might affect human health and biological processes. This work helped establish the foundation for understanding EMF bioeffects that continues to inform research today.
Wilbur P. Dayton · 1961
This 1961 technical report by Wilbur P. Dayton established one of the early formal research programs investigating the biological effects of microwave radiation. The document represents pioneering work in understanding how microwave frequencies might affect living systems, conducted during the Cold War era when microwave technology was rapidly expanding. This research laid important groundwork for decades of EMF health studies that followed.
Wilbur P. Dayton · 1961
This 1961 technical report by Wilbur P. Dayton documented a comprehensive microwave radiation effects program, examining how radar and microwave frequencies impact biological systems. The research was conducted during the early years of radar technology deployment when understanding microwave health effects became critical for military and civilian safety protocols.