Cell Phone Radiation: Evidence From ELF and RF Studies Supporting More Inclusive Risk Identification and Assessment

pubmed · 2009 · Harm · Moderate evidence

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HarmModerate evidencePaper 1766

Study snapshot

Publicationpubmed · 2009

Study typereview

Reported directionHarm

Evidence ratingModerate

Abstract

Cell Phone Radiation: Evidence From ELF and RF Studies Supporting More Inclusive Risk Identification and Assessment By Carl Blackman. Chapter 2: pp. 25-46. Abstract Many national and international exposure standards for maximum radiation exposure from the use of cell phones and other similar portable devices are ultimately based on the production of heat, particularly in regions of the head, that is, thermal effects (TE). The recent elevation in some countries of the allowable exposure, that is, averaging the exposure that occurs in a 6 minute period over 10 grams (g) of tissue rather than over 1 g, allows for greater heating in small portions of the 10-g volume compared to the exposure that would be allowed averaged over a 1-g volume. There is concern that 'hot' spots, that is, momentary higher intensities, could occur in portions of the 10-g tissue piece, which might have adverse consequences, particularly in brain tissue. There is another concern about exposure to cell phone radiation that has been virtually ignored except for the National Council of Radiation Protection and Measurements (NCRP) advice given in a publication in 1986 (National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.). This NCRP review and guidance explicitly acknowledged the existence of non-thermal effects (NTE), and included provisions for reduced maximum-allowable limits should certain radiation characteristics occur during the exposure. If we are to take most current national and international exposure standards as completely protective of thermal injury for acute exposure only (6 min time period), then the recent evidence from epidemiological studies associating increases in brain and head cancers with increased cell phone use per day and per year over 8-12 years raises concerns about the possible health consequences of NTE first acknowledged in the NCRP 1986 report (National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.). This paper will review some of the salient evidence that demonstrates the existence of NTE and the exposure complexities that must be considered and understood to provide appropriate, more thorough evaluation and guidance for future studies and for assessment of potential health consequences. Unfortunately, this paper is necessary because most national and international reviews of the research area since the 1986 report (National Council for Radiation Protection and Measurements, Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields, National Council for Radiation Protection and Measurements, 1986, 400 pp.) have not included scientists with expertise in NTE, or have not given appropriate attention to their requests to include NTE in the establishment of public health-based radiation exposure standards. Thus, those standards are limited because they are not comprehensive. There is substantial scientific evidence that some modulated fields (pulsed or repeated signals) are bioactive, which increases the likelihood that they could have health impacts with chronic exposure even at very low exposure levels. Modulation signals may interfere with normal, nonlinear biological processes. Modulation is a fundamental factor that should be taken into account in new public safety standards; at present it is not even a contributing factor. To properly evaluate the biological and health impacts of exposure to modulated RFR (carrier waves), it is also essential to study the impact of the modulating signal (lower frequency fields or ELF- modulated RF). Current standards have ignored modulation as a factor in human health impacts, and thus are inadequate in the protection of the public in terms of chronic exposure to some forms of ELF-modulated RF signals. The current Institute of Electrical and Electronic Engineers (IEEE) and International Commission on Non- Ionizing Radiation Protection (ICNIRP) standards are not sufficiently protective of public health with respect to chronic exposure to modulated fields (particularly new technologies that are pulse-modulated and heavily used in cellular telephony). The collective papers on modulation appear to be omitted from consideration in the recent World Health Organization (WHO) and IEEE science reviews. This body of research has been ignored by current standard setting bodies that rely only on traditional energy-based (thermal) concepts. More laboratory as opposed to epidemiological research is needed to determine which modulation factors and combinations are bioactive and deleterious at low intensities, and are likely to result in disease-related processes and/or health risks; however, this should not delay preventative actions supporting public health and wellness. If signals need to be modulated in the development of new wireless technologies, for example, it makes sense to use what existing scientific information is available to avoid the most obviously deleterious exposure parameters and select others that may be less likely to interfere with normal biological processes in life. The current membership on Risk Assessment committees needs to be made more inclusive by adding scientists experienced with producing nonthermal biological effects. The current practice of segregating scientific investigations (and resulting public health limits) by artificial, engineering-based divisions of frequency needs to be changed because this approach dramatically dilutes the impact of the basic science results and eliminates consideration of modulation signals, thereby reducing and distorting the weight of evidence in any evaluation process.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typereview

Effect directionharm

PopulationNot supplied

Sample sizeNot supplied

ExposureELF and RF · chronic exposure over years

Evidence strengthModerateConfidence: 70% · Peer reviewed: yes

Main findings

The paper reviews evidence supporting the existence of non-thermal effects (NTE) from cell phone radiation, particularly from modulated ELF and RF fields, which are not adequately considered in current exposure standards. It highlights concerns about chronic exposure leading to increased brain and head cancers and calls for more inclusive risk assessment that accounts for modulation and non-thermal effects.

Outcomes measured

brain and head cancers
non-thermal biological effects
health impacts from chronic exposure

Limitations

lack of direct new empirical data in this paper
reliance on existing literature and reviews
need for more laboratory research to identify specific bioactive modulation factors

View raw extracted JSON

{
  "study_type": "review",
  "exposure": {
    "band": "ELF and RF",
    "source": "cell phone radiation",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "chronic exposure over years"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "brain and head cancers",
    "non-thermal biological effects",
    "health impacts from chronic exposure"
  ],
  "main_findings": "The paper reviews evidence supporting the existence of non-thermal effects (NTE) from cell phone radiation, particularly from modulated ELF and RF fields, which are not adequately considered in current exposure standards. It highlights concerns about chronic exposure leading to increased brain and head cancers and calls for more inclusive risk assessment that accounts for modulation and non-thermal effects.",
  "effect_direction": "harm",
  "limitations": [
    "lack of direct new empirical data in this paper",
    "reliance on existing literature and reviews",
    "need for more laboratory research to identify specific bioactive modulation factors"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.7,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "cell phone radiation",
    "non-thermal effects",
    "ELF",
    "RF",
    "modulation",
    "exposure standards",
    "brain cancer",
    "risk assessment"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.8,
      "reason": "Discusses modulation and chronic exposure relevant to cellular telephony technologies."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: Not supplied

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