RF Safe

Evaluating temperature changes of brain tissue due to induced heating of cell phone waves

2018 · Harm · Low evidence

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HarmLow evidencePaper 2051

After 15 minutes of exposure to cell phone radiofrequency waves (900 MHz; head SAR 1.18 W/kg), tissue temperature increased versus baseline in all tested thicknesses: +0.53°C (2 mm), +0.99°C (12 mm), and +0.92°C (22 mm). The authors state the temperature incr…

Study snapshot

Publicationmanual · 2018
Study typeanimal
Reported directionHarm
Evidence ratingLow

Abstract

Evaluating temperature changes of brain tissue due to induced heating of cell phone waves Forouharmajd F, Pourabdian S, Hossein E. Evaluating temperature changes of brain tissue due to induced heating of cell phone waves. Intl J Prev Med. 9:40. Apr 2018 Background: Worries have recently been increased in the absorption of radiofrequency waves and their destructing effects on human health by increasing use of cell phones (mobile phones). This study performed to determine the thermal changes due to mobile phone radio frequency waves in gray and white brain tissue. Methods: This study is an empirical study, where the thermal changes of electromagnetic waves resulted from cell phones (900 MHZ, specific absorption rate for head 1.18 w/kg) on the 15 brain tissue of a cow were analyzed in a compartment with three different thickness of 2 mm, 12 mm, and 22 mm, for 15 min. The Lutron thermometer (model: MT-917) with 0.01 degrees C precision was used for measuring the tissue temperature. For each thickness was measured three times. Data analysis is done by Lutron and MATLAB software packages. Results: In confronting of the tissue with the cell phone, the temperature was increased by 0.53 degrees C in the 2 mm thickness that is the gray matter of the brain, increased by 0.99 degrees C in the 12 mm thickness, and also increased by 0.92 degrees C in the 22 mm thickness. Brain temperature showed higher rates than the base temperature after 15 min of confrontation with cell phone waves in all the three thicknesses. Conclusions: Cell phone radiated radio frequency waves were effective on increasing brain tissue temperature, and this temperature increase has cumulative effect on the tissue, being higher, for some time after the confrontation than the time with no confrontation. Open access paper: ijpvmjournal.net 7802;year=2018;volume=9;issue=1;spage=40;epage=40;aulast=Forouharmajd

Machine Enhanced Logic

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 typeanimal
Effect directionharm
PopulationCow brain tissue (gray and white matter; ex vivo)
Sample size15
ExposureRF · 900 MHz · 1.18 W/kg · 15 min
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

After 15 minutes of exposure to cell phone radiofrequency waves (900 MHz; head SAR 1.18 W/kg), tissue temperature increased versus baseline in all tested thicknesses: +0.53°C (2 mm), +0.99°C (12 mm), and +0.92°C (22 mm). The authors state the temperature increase persisted for some time after exposure and was described as cumulative.

Outcomes measured

  • Brain tissue temperature change (°C)

Limitations

  • Empirical ex vivo study on cow brain tissue; not a human in vivo study
  • Small sample size (15 tissue samples)
  • Exposure conditions limited to one frequency (900 MHz), one SAR value, and one exposure duration (15 min)
  • Only thermal outcome reported; no clinical/biological endpoints reported
  • Details on control conditions and timing of post-exposure measurements are not fully described in the abstract
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": 1.18,
    "duration": "15 min"
  },
  "population": "Cow brain tissue (gray and white matter; ex vivo)",
  "sample_size": 15,
  "outcomes": [
    "Brain tissue temperature change (°C)"
  ],
  "main_findings": "After 15 minutes of exposure to cell phone radiofrequency waves (900 MHz; head SAR 1.18 W/kg), tissue temperature increased versus baseline in all tested thicknesses: +0.53°C (2 mm), +0.99°C (12 mm), and +0.92°C (22 mm). The authors state the temperature increase persisted for some time after exposure and was described as cumulative.",
  "effect_direction": "harm",
  "limitations": [
    "Empirical ex vivo study on cow brain tissue; not a human in vivo study",
    "Small sample size (15 tissue samples)",
    "Exposure conditions limited to one frequency (900 MHz), one SAR value, and one exposure duration (15 min)",
    "Only thermal outcome reported; no clinical/biological endpoints reported",
    "Details on control conditions and timing of post-exposure measurements are not fully described in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "mobile phone",
    "radiofrequency",
    "900 MHz",
    "specific absorption rate",
    "SAR",
    "brain tissue",
    "gray matter",
    "white matter",
    "temperature",
    "thermal effects"
  ],
  "suggested_hubs": []
}
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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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