RF Safe

[Studies on the microwave leakage of the interphone].

Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases · 2004 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 6402

Microwave leakage intensities at 5 cm from the aerial part and other parts during launching (1316.0±144.3 and 971.0±131.6 microW/cm^2) were significantly higher than during waiting (14.4±5.3 and 13.2±4.9 microW/cm^2; P<0.01). At 50 cm, average leakage intensi…

Study snapshot

PublicationZhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases · 2004
Study typeexposure_assessment
Reported directionUnclear
Evidence ratingInsufficient

Abstract

OBJECTIVE: To assay and study the microwave leakage of 4 types of interphones. METHODS: The radiation intensities of four types of 199 interphones were determined by the microwave leakage measure instrument of model ML-91 made in China. RESULTS: The average intensities of microwave leakage at a distance of 5 cm from aerial part and other parts of interphones during launching [(1 316.0 +/- 144.3), (971.0 +/- 131.6) microW/cm(2) respectively] were significantly higher than during waiting [(14.4 +/- 5.3), (13.2 +/- 4.9) microW/cm(2) respectively] (P < 0.01). The average intensities of microwave leakage at a distance of 50 cm from different parts were (357.3 +/- 27.8) microW/cm(2). The daily average intensity of microwave leakage to which the head, chest and abdomen exposed was (945.5 +/- 447.1) microW.h/cm(2) in total, that exceeded the hygienic standard of microwave in China (400 microW.h/cm(2)), during the normal communication by interphones. CONCLUSION: The microwave leakage was higher during launching than during waiting, and was the highest at the aerial part of the interphones. The microwave radiation of most interphones was higher than the current national standard. It may lead to potential effects on the owner of interphone, so protection against it should be made.

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 size199
Exposuremicrowave · daily average exposure during normal communication
Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Microwave leakage intensities at 5 cm from the aerial part and other parts during launching (1316.0±144.3 and 971.0±131.6 microW/cm^2) were significantly higher than during waiting (14.4±5.3 and 13.2±4.9 microW/cm^2; P<0.01). At 50 cm, average leakage intensity from different parts was 357.3±27.8 microW/cm^2. The reported daily average exposure to head, chest, and abdomen during normal communication totaled 945.5±447.1 microW·h/cm^2, exceeding the cited Chinese hygienic standard (400 microW·h/cm^2).

Outcomes measured

  • Microwave leakage intensity (microW/cm^2) at 5 cm and 50 cm
  • Daily average microwave leakage exposure to head/chest/abdomen (microW·h/cm^2)
  • Exceedance of Chinese hygienic standard for microwave (400 microW·h/cm^2)

Limitations

  • No frequency information reported
  • No health outcomes measured (exposure assessment only)
  • Population/setting and usage patterns not described beyond 'normal communication'
  • Measurement details beyond instrument model are not provided in the abstract
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "microwave",
    "source": "interphone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "daily average exposure during normal communication"
  },
  "population": null,
  "sample_size": 199,
  "outcomes": [
    "Microwave leakage intensity (microW/cm^2) at 5 cm and 50 cm",
    "Daily average microwave leakage exposure to head/chest/abdomen (microW·h/cm^2)",
    "Exceedance of Chinese hygienic standard for microwave (400 microW·h/cm^2)"
  ],
  "main_findings": "Microwave leakage intensities at 5 cm from the aerial part and other parts during launching (1316.0±144.3 and 971.0±131.6 microW/cm^2) were significantly higher than during waiting (14.4±5.3 and 13.2±4.9 microW/cm^2; P<0.01). At 50 cm, average leakage intensity from different parts was 357.3±27.8 microW/cm^2. The reported daily average exposure to head, chest, and abdomen during normal communication totaled 945.5±447.1 microW·h/cm^2, exceeding the cited Chinese hygienic standard (400 microW·h/cm^2).",
  "effect_direction": "unclear",
  "limitations": [
    "No frequency information reported",
    "No health outcomes measured (exposure assessment only)",
    "Population/setting and usage patterns not described beyond 'normal communication'",
    "Measurement details beyond instrument model are not provided in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave leakage",
    "interphone",
    "radiation intensity",
    "occupational hygiene",
    "exposure measurement",
    "China standard"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.6,
      "reason": "Published in an industrial hygiene/occupational diseases journal and assesses exposure from interphones during use."
    }
  ]
}
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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: 15748479

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