A 60 Hz electric and magnetic field exposure facility for nonhuman primates: design and operational data during experiments.

PAPER pubmed Bioelectromagnetics 1995 Engineering / measurement Effect: unclear Evidence: Insufficient

Read original paper → DOI: 10.1002/bem.2250160703 PMID: 8787563 Evidence Lab

Abstract

A unique exposure facility was designed and constructed to generate large-scale vertical electric fields (EF) of up to 65 kV/m and horizontal magnetic fields (MF) of up to 100 microT (1G), so that the behavioral and neuroendocrine effects of 60 Hz EF or combined electric and magnetic field (E/MF) exposure could be examined using nonhuman primates as subjects. Facility design and operational problems and their solutions are presented, and representative operational data from four sets of experiments are provided. A specially designed, optically isolated, 4 cm spherical-dipole EF probe and a commercially available MF probe were used to map the EF and MF within the fiberglass animal cages. In addition, amplifiers, signal conditioners, and A/D converters provided EF, MF, and transformer signals to a microcomputer at 15 min intervals. The apparatus produced homogeneous, stable E/MF at the desired intensities, and the fiberglass cages did not produce appreciable distortion or attenuation. Levels of recognized EF artifacts such as corona and ozone were negligible. The facility worked as intended, providing a well-characterized and artifact-controlled environment for experiments with baboons (Papio cynocephalus).

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

unclear

Population

Nonhuman primates (baboons; Papio cynocephalus)

Sample size

—

Exposure

ELF exposure facility

Evidence strength

Insufficient

Confidence: 78% · Peer-reviewed: yes

Main findings

An exposure facility was designed to generate 60 Hz vertical electric fields up to 65 kV/m and horizontal magnetic fields up to 100 microT. Mapping and operational data indicated the apparatus produced homogeneous, stable fields at desired intensities with negligible corona/ozone artifacts and minimal distortion/attenuation from fiberglass cages.

Outcomes measured

Exposure facility design and operational performance
Electric field (EF) and magnetic field (MF) mapping within animal cages
Field homogeneity and stability
Assessment of EF-related artifacts (e.g., corona, ozone)

Limitations

No behavioral or neuroendocrine experimental results are reported in the abstract
Sample size and experimental protocols for the four sets of experiments are not described in the abstract
Exposure duration and schedules are not specified in the abstract

Suggested hubs

occupational-exposure (0.22)
Describes a controlled high-intensity 60 Hz EF/MF exposure setup and measurement methods relevant to exposure assessment contexts.

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "ELF",
        "source": "exposure facility",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Nonhuman primates (baboons; Papio cynocephalus)",
    "sample_size": null,
    "outcomes": [
        "Exposure facility design and operational performance",
        "Electric field (EF) and magnetic field (MF) mapping within animal cages",
        "Field homogeneity and stability",
        "Assessment of EF-related artifacts (e.g., corona, ozone)"
    ],
    "main_findings": "An exposure facility was designed to generate 60 Hz vertical electric fields up to 65 kV/m and horizontal magnetic fields up to 100 microT. Mapping and operational data indicated the apparatus produced homogeneous, stable fields at desired intensities with negligible corona/ozone artifacts and minimal distortion/attenuation from fiberglass cages.",
    "effect_direction": "unclear",
    "limitations": [
        "No behavioral or neuroendocrine experimental results are reported in the abstract",
        "Sample size and experimental protocols for the four sets of experiments are not described in the abstract",
        "Exposure duration and schedules are not specified in the abstract"
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "60 Hz",
        "ELF",
        "electric field",
        "magnetic field",
        "exposure facility",
        "nonhuman primates",
        "baboons",
        "Papio cynocephalus",
        "field mapping",
        "artifacts",
        "corona",
        "ozone"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.2200000000000000011102230246251565404236316680908203125,
            "reason": "Describes a controlled high-intensity 60 Hz EF/MF exposure setup and measurement methods relevant to exposure assessment contexts."
        }
    ]
}

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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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