Specific absorption rate variation in a brain phantom due to exposure by a 3G mobile phone: problems in dosimetry.

Indian journal of experimental biology · 2013 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3095

Study snapshot

PublicationIndian journal of experimental biology · 2013

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingInsufficient

Abstract

A specific absorption rate (SAR) measurements system has been developed for compliance testing of personal mobile phone in a brain phantom material contained in a Perspex box. The volume of the box has been chosen corresponding to the volume of a small rat and illuminated by a 3G mobile phone frequency (1718.5 MHz), and the emitted radiation directed toward brain phantom .The induced fields in the phantom material are measured. Set up to lift the plane carrying the mobile phone is run by a pulley whose motion is controlled by a stepper motor. The platform is made to move at a pre-determined rate of 2 degrees per min limited up to 20 degrees. The measured data for induced fields in various locations are used to compute corresponding SAR values and inter comparison obtained. These data are also compared with those when the mobile phone is placed horizontally with respect to the position of the animal. The SAR data is also experimentally obtained by measuring a rise in temperature due to this mobile exposures and data compared with those obtained in the previous set. To seek a comparison with the safety criteria same set of measurements are performed in 10 g phantom material contained in a cubical box. These results are higher than those obtained with the knowledge of induced field measurements. It is concluded that SAR values are sensitive to the angular position of the moving platform and are well below the safety criteria prescribed for human exposure. The data are suggestive of having a fresh look to understand the mode of electromagnetic field -bio interaction.

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 typeexposure_assessment

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF · 1718.5 MHz

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A SAR measurement system using a brain phantom was developed and used with a 3G mobile phone at 1718.5 MHz. SAR values varied with the angular position of the phone platform and differed depending on whether SAR was derived from induced-field measurements versus temperature-rise measurements; measurements in a 10 g phantom cube were higher than those inferred from induced-field measurements. The authors conclude SAR values were well below human safety criteria.

Outcomes measured

Induced electric/magnetic fields in brain phantom material
Computed SAR variation by location and phone angle
Temperature rise-based experimental SAR
Comparison of SAR in larger phantom vs 10 g phantom material

Limitations

Phantom/dosimetry study rather than direct biological or health outcomes
No numerical SAR values reported in the abstract
Exposure duration not stated
Phantom geometry/material and scaling to humans/animals not fully described in the abstract

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 1718.5,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Induced electric/magnetic fields in brain phantom material",
    "Computed SAR variation by location and phone angle",
    "Temperature rise-based experimental SAR",
    "Comparison of SAR in larger phantom vs 10 g phantom material"
  ],
  "main_findings": "A SAR measurement system using a brain phantom was developed and used with a 3G mobile phone at 1718.5 MHz. SAR values varied with the angular position of the phone platform and differed depending on whether SAR was derived from induced-field measurements versus temperature-rise measurements; measurements in a 10 g phantom cube were higher than those inferred from induced-field measurements. The authors conclude SAR values were well below human safety criteria.",
  "effect_direction": "unclear",
  "limitations": [
    "Phantom/dosimetry study rather than direct biological or health outcomes",
    "No numerical SAR values reported in the abstract",
    "Exposure duration not stated",
    "Phantom geometry/material and scaling to humans/animals not fully described in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "specific absorption rate",
    "SAR",
    "dosimetry",
    "brain phantom",
    "3G",
    "mobile phone",
    "1718.5 MHz",
    "induced fields",
    "temperature rise",
    "10 g phantom"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.32,
      "reason": "Mentions comparison to human safety criteria for RF exposure (compliance/dosimetry context)."
    }
  ]
}

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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: 24579373

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