Magnetic field exposure in a nondestructive testing operation.

Abstract

Nondestructive testing is any technique used to inspect the integrity of a manufactured item without diminishing its future usefulness. Magnetic particle inspection is one type of nondestructive testing that uses electromagnetism in the inspection procedure, thus potentially exposing the operator to magnetic fields. During magnetic particle inspection, investigators took peak magnetic field measurements of 8 turbine engine shafts at a turbine engine overhaul and repair center. They recorded 95 peak magnetic field measurements, ranging from < 0.1 to 29.27 mT. The exposure values measured were among the highest reported in the occupational setting. Further work is needed to characterize magnetic field exposures in magnetic particle inspection operations--in particular, by differentiating magnetic field magnitude by current frequency--and to understand exposure as it relates to different types of magnetic particle inspection devices.

AI evidence extraction

Main findings

Investigators recorded 95 peak magnetic field measurements during magnetic particle inspection of 8 turbine engine shafts, ranging from <0.1 to 29.27 mT. The measured exposure values were described as among the highest reported in occupational settings.

Outcomes measured

• Peak magnetic field measurements (mT) during magnetic particle inspection

Limitations

• Only peak magnetic field measurements reported; other exposure metrics not described in abstract
• Frequency characteristics of the magnetic fields were not differentiated; authors note need to characterize magnitude by current frequency
• Results pertain to measurements taken during inspection of 8 turbine engine shafts at a single facility; generalizability not stated
• Exposure differences by type of magnetic particle inspection device not characterized

Suggested hubs

• occupational-exposure (0.9)
  Study measures magnetic field exposure during an industrial nondestructive testing operation.

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "ELF",
        "source": "occupational",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Operators performing magnetic particle inspection (nondestructive testing) at a turbine engine overhaul and repair center",
    "sample_size": 8,
    "outcomes": [
        "Peak magnetic field measurements (mT) during magnetic particle inspection"
    ],
    "main_findings": "Investigators recorded 95 peak magnetic field measurements during magnetic particle inspection of 8 turbine engine shafts, ranging from <0.1 to 29.27 mT. The measured exposure values were described as among the highest reported in occupational settings.",
    "effect_direction": "unclear",
    "limitations": [
        "Only peak magnetic field measurements reported; other exposure metrics not described in abstract",
        "Frequency characteristics of the magnetic fields were not differentiated; authors note need to characterize magnitude by current frequency",
        "Results pertain to measurements taken during inspection of 8 turbine engine shafts at a single facility; generalizability not stated",
        "Exposure differences by type of magnetic particle inspection device not characterized"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "nondestructive testing",
        "magnetic particle inspection",
        "occupational exposure",
        "magnetic fields",
        "peak measurements",
        "turbine engine shafts",
        "mT"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.90000000000000002220446049250313080847263336181640625,
            "reason": "Study measures magnetic field exposure during an industrial nondestructive testing operation."
        }
    ]
}

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