A computer model of temperature distribution inside a lossy sphere after microwave radiation.

PAPER pubmed Bioelectromagnetics 1980 Engineering / measurement Effect: harm Evidence: Insufficient

Read original paper → DOI: 10.1002/bem.2250010309 PMID: 7284030 Evidence Lab

Abstract

The temperature distribution inside a lossy sphere resulting from the absorption of microwave energy was approximated by successive numerical iterations. of the thermal energy equation. Heat transfer within the sphere by conduction was considered. In the model energy was not dissipated by convection but was contained in the sphere for over 200 seconds. Exposure of a 5-cm sphere to 3,000 MHz at 30 mW/cm2 for 200 seconds was calculated to produce a temperature rise of 0.56 degrees C near the front surface.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

harm

Population

—

Sample size

—

Exposure

microwave · 3000 MHz · 200 seconds

Evidence strength

Insufficient

Confidence: 74% · Peer-reviewed: yes

Main findings

A numerical model of a 5-cm lossy sphere exposed to 3,000 MHz at 30 mW/cm2 for 200 seconds estimated a temperature rise of 0.56°C near the front surface, with heat transfer by conduction and no convective dissipation.

Outcomes measured

Temperature distribution
Temperature rise

Limitations

Model-based (computer simulation) rather than biological/epidemiological data
Convection was not included; energy was assumed contained in the sphere for over 200 seconds
Results are specific to a 5-cm sphere and the modeled exposure conditions

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 3000,
        "sar_wkg": null,
        "duration": "200 seconds"
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Temperature distribution",
        "Temperature rise"
    ],
    "main_findings": "A numerical model of a 5-cm lossy sphere exposed to 3,000 MHz at 30 mW/cm2 for 200 seconds estimated a temperature rise of 0.56°C near the front surface, with heat transfer by conduction and no convective dissipation.",
    "effect_direction": "harm",
    "limitations": [
        "Model-based (computer simulation) rather than biological/epidemiological data",
        "Convection was not included; energy was assumed contained in the sphere for over 200 seconds",
        "Results are specific to a 5-cm sphere and the modeled exposure conditions"
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "microwave radiation",
        "temperature distribution",
        "lossy sphere",
        "numerical iterations",
        "thermal energy equation",
        "heat conduction",
        "3000 MHz",
        "30 mW/cm2"
    ],
    "suggested_hubs": []
}

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

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