[Level of microwave radiation from mobile phone base stations built in residential districts].

Abstract

OBJECTIVE: To investigate the condition of microwave radiation pollution from mobile phone base station built in populated area. METHODS: Random selected 18 residential districts where had base station and 10 residential districts where had no base stations. A TES-92 electromagnetic radiation monitor were used to measure the intensity of microwave radiation in external and internal living environment. RESULTS: The intensities of microwave radiation in the exposure residential districts were more higher than those of the control residential districts (p < 0.05). There was a intensity peak at about 10 m from the station, it would gradually weaken with the increase of the distance. The level of microwave radiation in antenna main lobe region is not certainly more higher than the side lobe direction, and the side lobe direction also is not more lower. At the same district, where there were two base stations, the electromagnetic field nestification would take place in someplace. The intensities of microwave radiation outside the exposure windows in the resident room not only changed with distance but also with the height of the floor. The intensities of microwave radiation inside the aluminum alloys security net were more lower than those of outside the aluminum alloys security net (p < 0.05), but the inside or outside of glass-window appears almost no change (p > 0.05). CONCLUSIONS: Although all the measure dates on the ground around the base station could be below the primary standard in "environment electromagnetic wave hygienic standard" (GB9175-88), there were still a minorities of windows which exposed to the base station were higher, and the outside or inside of a few window was even higher beyond the primary safe level defined standard. The aluminum alloys security net can partly shield the microwave radiation from the mobile phone base station.

AI evidence extraction

Main findings

Measurements in residential districts with base stations were higher than in districts without base stations (p<0.05). Intensity peaked at about 10 m from the station and generally decreased with distance; some window measurements exposed to base stations exceeded the GB9175-88 primary standard/safe level. Aluminum alloy security nets reduced measured intensity compared with outside the net (p<0.05), while glass windows showed almost no change (p>0.05).

Outcomes measured

• Microwave radiation intensity levels in residential districts (external and internal living environment)
• Distance-related variation in measured intensity around base stations
• Variation by antenna lobe direction (main vs side lobe)
• Potential field superposition/"nestification" in areas with two base stations
• Variation by floor height at windows
• Shielding effect of aluminum alloy security net vs glass window
• Proportion of measurements exceeding GB9175-88 primary standard/safe level

Limitations

• No frequency information reported
• No quantitative exposure values reported in the abstract
• Health outcomes were not assessed; study focuses on environmental measurements
• Sampling described as random selection of districts but details of selection and measurement protocol are not provided in the abstract

Suggested hubs

• occupational-exposure (0)

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "microwave",
        "source": "mobile phone base station",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": 28,
    "outcomes": [
        "Microwave radiation intensity levels in residential districts (external and internal living environment)",
        "Distance-related variation in measured intensity around base stations",
        "Variation by antenna lobe direction (main vs side lobe)",
        "Potential field superposition/\"nestification\" in areas with two base stations",
        "Variation by floor height at windows",
        "Shielding effect of aluminum alloy security net vs glass window",
        "Proportion of measurements exceeding GB9175-88 primary standard/safe level"
    ],
    "main_findings": "Measurements in residential districts with base stations were higher than in districts without base stations (p<0.05). Intensity peaked at about 10 m from the station and generally decreased with distance; some window measurements exposed to base stations exceeded the GB9175-88 primary standard/safe level. Aluminum alloy security nets reduced measured intensity compared with outside the net (p<0.05), while glass windows showed almost no change (p>0.05).",
    "effect_direction": "harm",
    "limitations": [
        "No frequency information reported",
        "No quantitative exposure values reported in the abstract",
        "Health outcomes were not assessed; study focuses on environmental measurements",
        "Sampling described as random selection of districts but details of selection and measurement protocol are not provided in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "microwave radiation",
        "mobile phone base station",
        "residential districts",
        "environmental monitoring",
        "distance decay",
        "windows",
        "shielding",
        "GB9175-88"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0,
            "reason": null
        }
    ]
}

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