Glossary
Plain-language definitions of the EMR, EMF, and building biology terminology used throughout this site.
Physics & Measurement Units
EMR (Electromagnetic Radiation)
Energy that travels through space as waves or particles, spanning the full spectrum from extremely low frequency (ELF) power lines through radio waves to visible light, X-rays, and gamma rays. On this site, "EMR" usually refers specifically to the non-ionizing portion of the spectrum used in telecommunications and power distribution.
EMF (Electromagnetic Field)
The combined electric and magnetic field generated by any electrical device or transmission line. Often used interchangeably with EMR, though EMF technically refers to the field itself rather than the radiated energy.
RF (Radiofrequency)
The portion of the electromagnetic spectrum (roughly 3 kHz to 300 GHz) used by mobile networks, Wi-Fi, Bluetooth, and broadcast radio/TV. RF exposure is typically measured as power density.
ELF (Extremely Low Frequency)
Electromagnetic fields below 300 Hz, primarily associated with AC power infrastructure — power lines, household wiring, and appliances. Measured as magnetic flux density.
ULF (Ultra Low Frequency)
Fields in the 300 Hz–3 kHz range, sitting between ELF power-line frequencies and the lower end of the RF spectrum.
Non-Ionizing Radiation
Radiation that lacks enough energy per photon to strip electrons from atoms (ionize them) — unlike X-rays or gamma rays. RF, ELF, and visible light are all non-ionizing. Official safety guidelines have historically assumed non-ionizing radiation can only cause harm through heating, a premise independent researchers dispute (see the Biological Mechanisms and Thermal vs. Non-Thermal chapters).
Thermal Effect
Tissue heating caused by RF energy absorption. The sole basis for ICNIRP and FCC exposure limits.
Non-Thermal Effect
A biological change occurring at exposure levels too low to produce measurable heating — for example, VGCC activation, oxidative stress, or DNA strand breaks. Central to the independent research this site covers, and explicitly excluded from official guideline calculations.
SAR (Specific Absorption Rate)
A measure of RF energy absorbed per kilogram of body tissue (W/kg), used as the basis for device-level thermal safety limits (e.g. mobile phone certification). SAR only captures thermal effects, not non-thermal ones.
Power Density
The rate of RF energy flow through a given area, typically expressed in watts per square metre (W/m²) or, at the very low levels relevant to precautionary guidelines, microwatts per square metre (µW/m²). The unit used throughout this site's Magnitude Gap comparisons.
Magnetic Flux Density
The strength of a magnetic field, measured in microtesla (µT) or milligauss (mG) in the building-biology context (1 mG ≈ 0.1 µT). Relevant to ELF exposure from wiring and appliances.
V/m (Volts per Metre)
A unit of electric field strength, sometimes used alongside or instead of power density for RF measurements.
Near-Field / Far-Field
Near-field describes the region very close to an RF source (e.g. a phone against the head), where field behaviour is complex and exposure can be highly localized. Far-field describes the region beyond roughly one wavelength, where standard power-density measurements apply cleanly.
Biological Mechanisms
VGCC (Voltage-Gated Calcium Channel)
A cell-membrane channel that opens in response to electrical changes, allowing calcium ions into the cell. Martin Pall's research proposes VGCC activation by RF/EMF as the primary non-thermal mechanism linking exposure to oxidative stress and downstream health effects — see the Biological Mechanisms chapter.
Oxidative Stress
A cellular imbalance between reactive oxygen species (free radicals) and the antioxidants that neutralize them, implicated in aging, inflammation, and chronic disease. Repeatedly documented in independent RF-exposure studies at non-thermal levels.
ROS (Reactive Oxygen Species)
Chemically reactive molecules containing oxygen, produced as a byproduct of normal metabolism and elevated by oxidative stress. A key measured outcome in non-thermal EMR bioeffect studies.
Blood-Brain Barrier (BBB)
The selective membrane that normally prevents most substances in the bloodstream from entering brain tissue. Leif Salford's research documented increased BBB permeability at non-thermal RF exposure levels, potentially allowing harmful substances into neural tissue.
EHS (Electromagnetic Hypersensitivity)
A reported condition in which individuals experience physical symptoms (headaches, fatigue, sleep disturbance) they attribute to EMF exposure, at levels far below current guidelines. Conventional medicine generally attributes EHS to nocebo effect; a 2024 Henshaw & Philips paper proposes a magnetoreception-based mechanistic basis instead (see the Cross-Species Evidence section of the Resources & Standards chapter).
Melatonin Suppression
Reduced production of the sleep-regulating hormone melatonin, linked in independent research to EMR exposure and implicated as a mechanism connecting EMR to sleep disruption and broader health effects.
DNA Strand Breaks
Physical breaks in the DNA double helix. Henry Lai and N.P. Singh's landmark studies documented strand breaks in rat brain cells following low-intensity microwave exposure — findings central to the History & Suppression chapter.
Regulatory Bodies & Standards
ICNIRP
International Commission on Non-Ionizing Radiation Protection — a self-appointed private body whose thermal-only guidelines are adopted by most national regulators, including Australia's ARPANSA. Critiqued at length in the Regulatory Capture chapter.
FCC (Federal Communications Commission)
The US regulator whose RF exposure limits, set in 1996, remain thermal-only and have not been substantively updated despite a 2021 federal court ruling that the FCC failed to justify not doing so.
ARPANSA
Australian Radiation Protection and Nuclear Safety Agency — Australia's regulator, which largely adopts ICNIRP guidelines with minor adjustments rather than conducting independent biological research.
WHO (World Health Organization)
Operates the International EMF Project, historically closely tied to ICNIRP (its first head was also ICNIRP's founder). Its research arm, IARC, classified RF-EMF as a Group 2B possible carcinogen in 2011.
IARC
International Agency for Research on Cancer, the WHO's cancer research arm. Classified radiofrequency EMF as a Group 2B "possible human carcinogen" in 2011 — a classification some researchers argue is now outdated given more recent evidence.
SBM-2015
The German Institute for Building Biology & Ecology's precautionary evaluation standard for sleeping areas, using far lower thresholds than ICNIRP — detailed in the Resources & Standards chapter's SBM-2015 section.
EMERG
Electromagnetic Energy Reference Group — ARPANSA's public-representative committee; ORSAA co-founder Steve Weller sits on it.
Building Biology
A discipline (originating in Germany) that assesses indoor environments — EMR, air quality, mould, and materials — against precautionary health-based standards rather than industrial safety limits.
Assessment & Practice
TSCM (Technical Surveillance Counter-Measures)
The practice of detecting unauthorized surveillance devices (hidden transmitters, "bugs") using spectrum analysis and physical inspection — one of EMRSTOP's core service categories.
IAQ (Indoor Air Quality)
The condition of air within a building, encompassing particulates, VOCs, and allergens — assessed alongside EMR in a holistic building-biology evaluation.
Dirty Electricity
High-frequency electrical noise (transients) riding on standard 50/60 Hz power wiring, produced by switching-mode power supplies, dimmers, and similar devices. Measured separately from standard AC magnetic fields.
Spectrum Analyzer
A professional-grade instrument that measures RF signal strength across a range of frequencies, allowing specific sources to be identified — as opposed to a broadband meter, which only reports total combined exposure.
Broadband Meter
A portable meter that measures total RF exposure across a wide frequency range without distinguishing between sources. Useful for general assessment but not source identification.
Organizations Cited on This Site
ORSAA
Oceania Radiofrequency Scientific Advisory Association — an independent Australian body maintaining a large systematic database of RF-EMF bioeffect studies. Full profile on the Resources page.
BioInitiative Working Group
An international group of scientists and public health experts whose BioInitiative Report reviews thousands of peer-reviewed non-thermal effect studies. Source of the Magnitude Gap chart reproduced in the Resources & Standards chapter.
ICEMS
International Commission for Electromagnetic Safety — an independent body of researchers and physicians investigating non-ionizing radiation risk, and source of several of the resolutions listed on the Resources page.
ICBE-EMF
International Commission on the Biological Effects of Electromagnetic Fields — formed by scientists and policy experts to propose exposure guidelines independent of bodies like ICNIRP.
CSIRO
Australia's national science agency, which once ran early EMR bioeffects research before funding was withdrawn — discussed in the History & Suppression chapter.
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