[Method for summing up the radio-frequency electromagnetic fields emitted by several sources].

Problemi na khigienata · 1986 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 5496

The paper describes a developed method (included in BSS 14525-78) for measuring and assessing RF EMF at workplaces, and proposes a mathematical method/algorithm to enable summing and hygienic assessment when multiple sources with different frequencies are pre…

Study snapshot

PublicationProblemi na khigienata · 1986

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

A method has been developed, included in the BSS 14525-78, for measuring and assessment of the radio-frequency electromagnetic field (EMF) at the working places. In a hygienic assessment of fields, emitted from several sources with different frequencies in one premises, it cannot be applied because of the step frequency relationship of the hygienic norms. The same difficulty is encountered in the hygienic assessment of EMF in settlements, where the summing of the from several radio television and other emitters is necessary. With the non-selective measurements of the intensities of EMF (in a broad-frequency range) in such cases, the resultant field of the working place cannot de resolve into component intensities, obtained from the separate generators and hygienic assessment of the determined value cannot be performed. The same concerns also the cases when we separately measure the radiation from each separate emitter--the summing is impossible. If the electromagnetic waves are discussed as flat waves in the free space, a system of 2m equations with 3 m unknown quantities could be worked out after several approximations, where m is the number of the emitting generators in the premises. Furthermore, if consideration is given to the technical devices for measurement of EMF (type of detector), a system of 2 m equations with so many unknown quantities, could be obtained, hence a mathematical method is proposed for its solving. The expression of the intensities of the field is approximated in a polynomial and an original algorithm is proposed for the solving of the system.(ABSTRACT TRUNCATED AT 250 WORDS)

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 typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthInsufficientConfidence: 66% · Peer reviewed: yes

Main findings

Outcomes measured

Method for measuring and hygienic assessment of RF electromagnetic fields from multiple sources
Algorithm/mathematical approach to sum RF EMF contributions across different frequencies
Application to workplaces and settlements with multiple emitters

Limitations

Abstract is truncated and does not provide full methodological details or validation results
No quantitative results, performance metrics, or comparison to other methods are provided in the abstract
Frequencies, measurement conditions, and specific detector characteristics are not specified

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Method for measuring and hygienic assessment of RF electromagnetic fields from multiple sources",
    "Algorithm/mathematical approach to sum RF EMF contributions across different frequencies",
    "Application to workplaces and settlements with multiple emitters"
  ],
  "main_findings": "The paper describes a developed method (included in BSS 14525-78) for measuring and assessing RF EMF at workplaces, and proposes a mathematical method/algorithm to enable summing and hygienic assessment when multiple sources with different frequencies are present and direct summing is otherwise not possible.",
  "effect_direction": "unclear",
  "limitations": [
    "Abstract is truncated and does not provide full methodological details or validation results",
    "No quantitative results, performance metrics, or comparison to other methods are provided in the abstract",
    "Frequencies, measurement conditions, and specific detector characteristics are not specified"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radio-frequency",
    "electromagnetic field",
    "measurement",
    "assessment",
    "hygienic norms",
    "multiple sources",
    "workplaces",
    "settlements",
    "radio",
    "television",
    "algorithm",
    "polynomial approximation"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.78,
      "reason": "Focuses on measuring and hygienic assessment of RF EMF at working places with multiple emitters."
    }
  ]
}

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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: Not supplied
PubMed: 3823042

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