Whole-body and local dosimetry in rats exposed to 2.45-GHz microwave radiation.

Health physics · 1984 · Unclear · Insufficient evidence

← Research stream

UnclearInsufficient evidencePaper 5926

Whole-body SAR decreased with increasing body weight/size, with a reported 12-fold lower whole-body SAR in 5 g pups compared with 320 g adults. Local SARs exceeded whole-body SARs: colon local SAR was slightly higher for 40–320 g animals and ~2.5× higher for …

Study snapshot

PublicationHealth physics · 1984

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Rat cadavers oriented parallel to the electric field were exposed to 2.45-GHz microwave radiation. The weights of the cadavers ranged from approx. 5 to 320 g and their lengths ranged from approx. 5 to 21.5 cm. Whole-body specific absorption rates (SAR) were measured using calorimetric techniques, and local specific absorption rates were obtained from time-temperature profiles measured with a non-interacting thermistor probe (Vitek). The whole-body SARs decreased by a factor of 12 in rat pups weighing 5 g as compared to adult rats weighing 320 g. The local SARs in the colon were slightly higher than the whole-body SARs for animals in the weight range from 40 to 320 g and approx. 2.5 times higher in animals ranging from 10 to 30 g. The local SARs in the brain were two to three times higher than the whole-body SARs for animals ranging in weights from 20 to 320 g. The data show that it is important to measure both whole-body SARs and local SARs when conducting experiments to determine biological effects in order to adequately explain any biological changes and to extrapolate data from different sizes and species of animals.

Machine Enhanced Logic

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 typeexposure_assessment

Effect directionunclear

PopulationRat cadavers (various sizes/weights)

Sample sizeNot supplied

Exposuremicrowave · 2450 MHz

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Whole-body specific absorption rate (SAR)
Local SAR in colon
Local SAR in brain

Limitations

Cadaver (non-living) model; does not assess biological/health outcomes
Sample size not reported in abstract
Exposure conditions beyond orientation (e.g., field strength/power density, duration) not reported in abstract

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Rat cadavers (various sizes/weights)",
  "sample_size": null,
  "outcomes": [
    "Whole-body specific absorption rate (SAR)",
    "Local SAR in colon",
    "Local SAR in brain"
  ],
  "main_findings": "Whole-body SAR decreased with increasing body weight/size, with a reported 12-fold lower whole-body SAR in 5 g pups compared with 320 g adults. Local SARs exceeded whole-body SARs: colon local SAR was slightly higher for 40–320 g animals and ~2.5× higher for 10–30 g animals; brain local SAR was ~2–3× higher than whole-body SAR for 20–320 g animals.",
  "effect_direction": "unclear",
  "limitations": [
    "Cadaver (non-living) model; does not assess biological/health outcomes",
    "Sample size not reported in abstract",
    "Exposure conditions beyond orientation (e.g., field strength/power density, duration) not reported in abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "2.45 GHz",
    "microwave radiation",
    "dosimetry",
    "specific absorption rate",
    "SAR",
    "calorimetry",
    "thermistor probe",
    "rat cadavers",
    "whole-body SAR",
    "local SAR",
    "brain",
    "colon"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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: 10.1097/00004032-198402000-00007
PubMed: 6693262

Read the original paper →

Related papers

← Back to the Research Library