Estimation of SAR Average in Rats during 5G NR Chronic Exposure

Applied Sciences · 2024 · Unclear · Insufficient evidence

← Research stream

UnclearInsufficient evidencePaper 240

Study snapshot

PublicationApplied Sciences · 2024

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Estimation of SAR Average in Rats during 5G NR Chronic Exposure Makhmanazarov R, Tseplyaev I, Shipilov S, Krivova N. Estimation of SAR Average in Rats during 5G NR Chronic Exposure. Applied Sciences. 2024; 14(1):208. doi: 10.3390/app14010208. Abstract To study physiological reactions in the brain and skin of higher mammals exposed to chronic radiofrequency radiation, specific absorption ratio (SAR) determination is required and time-consuming numerical methods are used. The paper deals with the estimation of the whole-body specific absorption rate (SAR) in rats chronically exposed to external electromagnetic fields, as well as the development of a laboratory setup simulating the operation of a fifth-generation 5G New Radio base station (with a signal bandwidth of 15 MHz and a carrier frequency of 2.4 GHz). The paper presents a modified method for theoretical SAR estimation for one-sided irradiation and distributed absorption. Mean whole-body SAR values were estimated by the proposed method and numerically modeled with the CST Microwave Studio simulation software 2020package using primitive rat models. Dielectric parameters in the numerical simulation were used from the software library. The IEEE/IEC 62704-1 algorithm was used to investigate SAR in numerical simulations. The theoretical estimates and numerical simulations were compared for different SAR distributions and were found to be qualitatively comparable. The differences between approximate theoretical estimates and numerical simulations are 7% and 10% for distributed and non-distributed absorptions, respectively. The proposed method, which takes into account the decreasing power flux density, can be used to estimate the approximate whole-body SAR during chronic electromagnetic field exposure in rats. Open access paper: mdpi.com

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

Populationrats

Sample sizeNot supplied

ExposureRF · 2400 MHz · chronic

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

The paper proposes a modified theoretical method to estimate mean whole-body SAR in rats under one-sided irradiation and distributed absorption during chronic exposure to a simulated 5G NR base-station-like signal (15 MHz bandwidth, 2.4 GHz carrier). Theoretical estimates were qualitatively comparable to CST Microwave Studio numerical simulations; reported differences were 7% (distributed absorption) and 10% (non-distributed absorption).

Outcomes measured

Whole-body specific absorption rate (SAR) estimation
Comparison of theoretical SAR estimates vs numerical simulations (CST Microwave Studio)
Differences between theoretical estimates and numerical simulations for distributed vs non-distributed absorption

Limitations

Uses primitive rat models in CST Microwave Studio simulations
Dielectric parameters taken from the software library (not measured in-study)
Focuses on SAR estimation/comparison rather than biological or health outcomes

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "base station",
    "frequency_mhz": 2400,
    "sar_wkg": null,
    "duration": "chronic"
  },
  "population": "rats",
  "sample_size": null,
  "outcomes": [
    "Whole-body specific absorption rate (SAR) estimation",
    "Comparison of theoretical SAR estimates vs numerical simulations (CST Microwave Studio)",
    "Differences between theoretical estimates and numerical simulations for distributed vs non-distributed absorption"
  ],
  "main_findings": "The paper proposes a modified theoretical method to estimate mean whole-body SAR in rats under one-sided irradiation and distributed absorption during chronic exposure to a simulated 5G NR base-station-like signal (15 MHz bandwidth, 2.4 GHz carrier). Theoretical estimates were qualitatively comparable to CST Microwave Studio numerical simulations; reported differences were 7% (distributed absorption) and 10% (non-distributed absorption).",
  "effect_direction": "unclear",
  "limitations": [
    "Uses primitive rat models in CST Microwave Studio simulations",
    "Dielectric parameters taken from the software library (not measured in-study)",
    "Focuses on SAR estimation/comparison rather than biological or health outcomes"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "specific absorption rate",
    "SAR",
    "rats",
    "chronic exposure",
    "5G NR",
    "base station",
    "2.4 GHz",
    "15 MHz bandwidth",
    "CST Microwave Studio",
    "IEEE/IEC 62704-1",
    "one-sided irradiation",
    "distributed absorption",
    "power flux density"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.2,
      "reason": "Study simulates a 5G NR base-station-like signal for chronic exposure SAR estimation in rats."
    }
  ]
}

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: 10.3390/app14010208
PubMed: Not supplied

Read the original paper →

Related papers

← Back to the Research Library