Experimental and numerical assessment of low-frequency current distributions from UMTS and GSM mobile phones.

Physics in medicine and biology · 2013 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 4563

Study snapshot

PublicationPhysics in medicine and biology · 2013

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingInsufficient

Abstract

The evaluation of the exposure from mobile communication devices requires consideration of electromagnetic fields (EMFs) over a broad frequency range from dc to GHz. Mobile phones in operation have prominent spectral components in the low-frequency (LF) and radio-frequency (RF) ranges. While the exposure to RF fields from mobile phones has been comprehensively assessed in the past, the LF fields have received much less attention. In this study, LF fields from mobile phones are assessed experimentally and numerically for the global system for mobile (GSM) and universal mobile telecommunications system (UMTS) communication systems and conclusions about the global (LF and RF) EMF exposure from both systems are drawn. From the measurements of the time-domain magnetic fields, it was found that the contribution from the audio signal at a normal speech level, i.e., -16 dBm0, is the same order of magnitude as the fields induced by the current bursts generated from the implementation of the GSM communication system at maximum RF output level. The B-field induced by currents in phones using the UMTS is two orders of magnitude lower than that induced by GSM. Knowing that the RF exposure from the UMTS is also two orders of magnitude lower than from GSM, it is now possible to state that there is an overall reduction of the exposure from this communication system.

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

ExposureLF and RF

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

From time-domain magnetic-field measurements, the contribution from the audio signal at normal speech level (-16 dBm0) was of the same order of magnitude as fields induced by current bursts from GSM at maximum RF output level. The B-field induced by currents in UMTS phones was two orders of magnitude lower than that induced by GSM, and the abstract states RF exposure from UMTS is also two orders of magnitude lower than from GSM, implying an overall exposure reduction for UMTS versus GSM.

Outcomes measured

Time-domain magnetic field (B-field) measurements from mobile phones
Relative magnitude of LF field contributions (audio signal vs GSM current bursts)
Comparison of LF and RF exposure levels between UMTS and GSM

Limitations

No frequencies, measurement setup details, or numerical modeling parameters are provided in the abstract.
No sample size or number of phone models/conditions tested is stated.
Findings are comparative (UMTS vs GSM) and do not report health outcomes.

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "LF and RF",
    "source": "mobile phone (GSM, UMTS)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Time-domain magnetic field (B-field) measurements from mobile phones",
    "Relative magnitude of LF field contributions (audio signal vs GSM current bursts)",
    "Comparison of LF and RF exposure levels between UMTS and GSM"
  ],
  "main_findings": "From time-domain magnetic-field measurements, the contribution from the audio signal at normal speech level (-16 dBm0) was of the same order of magnitude as fields induced by current bursts from GSM at maximum RF output level. The B-field induced by currents in UMTS phones was two orders of magnitude lower than that induced by GSM, and the abstract states RF exposure from UMTS is also two orders of magnitude lower than from GSM, implying an overall exposure reduction for UMTS versus GSM.",
  "effect_direction": "unclear",
  "limitations": [
    "No frequencies, measurement setup details, or numerical modeling parameters are provided in the abstract.",
    "No sample size or number of phone models/conditions tested is stated.",
    "Findings are comparative (UMTS vs GSM) and do not report health outcomes."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "low-frequency",
    "radio-frequency",
    "mobile phone",
    "GSM",
    "UMTS",
    "magnetic field",
    "B-field",
    "current bursts",
    "audio signal",
    "exposure assessment",
    "numerical assessment"
  ],
  "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: 10.1088/0031-9155/58/23/8339
PubMed: 24216774

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