Effect of 50-Hz electromagnetic field on the retention of toxic radionuclides in rat tissues.

Reviews on environmental health · 1997 · Mixed · Low evidence

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MixedLow evidencePaper 5403

Study snapshot

PublicationReviews on environmental health · 1997

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

The effect of electromagnetic field (EMF) 50 Hz, 10 mT, on the tissue retention of radiotoxic polonium-210 and thorium-234 was studied in a rat model. Regarding 210Po in the ionic state, small but significant effects were obtained by exposure of rats to EMF either before the intravenous injection of 210Po (pre-exposure) or after the rats had already been injected with 210Po (post-exposure). When compared with control values, pre-exposure to EMF caused a significant 28% decrease in the retention of 210Po in the skin and a 10% decrease in total 210Po retention in the investigated tissues. Relative to controls, post-exposure resulted in a 131% increase in 210Po retention only in the thymus. Regarding carrier-free 234Th in the ionic state, both types of EMF exposure caused a substantial increase in 234Th retention in the liver and spleen and a decrease of 234Th in the bones. A different effect of EMF on the retention of 234Th in the body was obtained when the mass of thorium was increased by adding as carrier 232Th (50 micrograms kg-1 body mass). With pre-exposure, a significant 10% decrease in the high retention of 234Th in the liver (77% of injected radioactivity) was observed. On the other hand, with post-exposure no significant changes in retention of 234Th were found in the tissues.

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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 typeanimal

Effect directionmixed

PopulationRats

Sample sizeNot supplied

ExposureELF · 0.05 MHz

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In rats exposed to a 50 Hz, 10 mT EMF, pre-exposure or post-exposure produced small but significant changes in retention of ionic 210Po: pre-exposure decreased skin retention by 28% and total retention in investigated tissues by 10%, while post-exposure increased retention by 131% in the thymus only. For carrier-free ionic 234Th, both pre- and post-exposure increased retention in liver and spleen and decreased retention in bones. When 232Th carrier (50 micrograms/kg body mass) was added, pre-exposure decreased liver retention of 234Th by 10%, whereas post-exposure produced no significant tissue retention changes.

Outcomes measured

Tissue retention of polonium-210 (210Po)
Tissue retention of thorium-234 (234Th)
Tissue retention of thorium-234 (234Th) with 232Th carrier added

Limitations

Sample size not reported in abstract
Exposure duration and timing details beyond pre-/post-exposure not provided
Endpoints limited to radionuclide tissue retention in a rat model; generalizability to humans not addressed

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Rats",
  "sample_size": null,
  "outcomes": [
    "Tissue retention of polonium-210 (210Po)",
    "Tissue retention of thorium-234 (234Th)",
    "Tissue retention of thorium-234 (234Th) with 232Th carrier added"
  ],
  "main_findings": "In rats exposed to a 50 Hz, 10 mT EMF, pre-exposure or post-exposure produced small but significant changes in retention of ionic 210Po: pre-exposure decreased skin retention by 28% and total retention in investigated tissues by 10%, while post-exposure increased retention by 131% in the thymus only. For carrier-free ionic 234Th, both pre- and post-exposure increased retention in liver and spleen and decreased retention in bones. When 232Th carrier (50 micrograms/kg body mass) was added, pre-exposure decreased liver retention of 234Th by 10%, whereas post-exposure produced no significant tissue retention changes.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure duration and timing details beyond pre-/post-exposure not provided",
    "Endpoints limited to radionuclide tissue retention in a rat model; generalizability to humans not addressed"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "50 Hz",
    "10 mT",
    "ELF electromagnetic field",
    "rat model",
    "polonium-210",
    "thorium-234",
    "thorium-232 carrier",
    "tissue retention",
    "liver",
    "spleen",
    "bones",
    "thymus",
    "skin"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Study involves ELF (50 Hz) magnetic field exposure, relevant to occupational/industrial EMF contexts, though no workplace setting is specified."
    }
  ]
}

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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: 10.1515/reveh.1997.12.3.171
PubMed: 9406288

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