PROPOSED TLV FOR RADIOFREQUENCY RADIATION
Authors not listed · 1979
1979 workplace RF safety limits became the basis for today's standards affecting billions of wireless device users.
Plain English Summary
This 1979 technical report proposed threshold limit values (TLV) for radiofrequency radiation exposure in occupational settings. The document addressed workplace safety standards for microwave and RF electromagnetic energy, establishing guidelines for how much exposure workers could safely receive. This represents early efforts to regulate RF radiation before widespread consumer electronics adoption.
Why This Matters
This 1979 document captures a pivotal moment in RF radiation safety policy, when regulators first grappled with setting exposure limits for workers handling microwave and radiofrequency equipment. The science demonstrates that these early threshold limit values became the foundation for today's exposure standards, yet they were established with limited long-term health data. What makes this historically significant is the timing - these occupational limits were set decades before billions of people began carrying RF-emitting devices daily. The reality is that today's consumer exposures from smartphones, WiFi, and wireless devices often approach or exceed what was once considered safe only for trained workers in controlled industrial settings. Put simply, we're now living with RF exposures that were originally deemed appropriate only for occupational environments with safety protocols.
Finding
The TLV is based upon that incident microwave energy which would cause no more than a doubling of an individual's basal metabolic rate (BMR).
In their words
“The TLV is based upon that incident microwave energy which would cause no more than a doubling of an individual's basal metabolic rate (BMR).”
Source
(1979) (1979)Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
The TLV is based upon that incident microwave energy which would cause no more than a doubling of an individual's basal metabolic rate (BMR). The BMR of a human is approximately 1 W/kg (1 kcal/min) or about 75 W for a 70-kg standard man. An externally applied thermal load equivalent to the BMR from a microwave field incident on one side of the body would, therefore, require 75 W of absorbed power over a 0.95 m² geometric cross section of a standard man. Neglecting reflection at the surface (which may be greater than 50 percent), this calculates to an incident flux of approximately 8 mW/cm² which must be totally absorbed. Since reflection has been neglected and there is no evidence for whole-body resonant absorption by adults in this region, the TLV appears to be quite conservative and not unreasonable. This heat load is equivalent to approximately one-half of the thermal load generated from walking and, although the distribution of heat may not be as uniformly distributed through the body, the committee believes that it is within the human thermoregulatory capability.
Show BibTeX
@article{proposed_tlv_for_radiofrequency_radiation_g5210,
author = {Unknown},
title = {PROPOSED TLV FOR RADIOFREQUENCY RADIATION},
year = {1979},
}