Link to our free October 2024 Newsletter https://mailchi.mp/emfsa/ehs-cfs-me

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Metal roofs, due to their conductive properties, can act as unintended RF antennas. This effect is amplified when a metal roof is unearthed, increasing the likelihood of radiofrequency (RF) radiation hotspots. In these cases, the metal roof can pick up and re-radiate RF signals from nearby sources, creating potential hazards.

However, when properly grounded, metal roofs can serve as excellent protection against radiation. A grounded metal roof can shield the building’s interior from external RF and electromagnetic fields. This protective capability depends on the roof’s earthing, ensuring that any accumulated electric charges are safely dissipated into the ground.

One key risk of an unearthed metal roof is jump conduction, where RF radiation generates high electric fields. If these fields exceed a certain threshold, electric currents can arc across air gaps, leading to discharges. Without grounding, these charges can’t be safely channeled, increasing the risk of electrical events.

In addition, metal roofs often consist of different parts, such as sections at varying levels, which can create junctions or gaps. These discontinuities may exacerbate RF reception and hotspots, particularly if the entire system isn’t uniformly grounded. Electrical imbalances between the roof sections can lead to uneven charge distribution and increased RF pickup.

Moisture can further complicate this issue, especially in homes with rising damp. Wet conditions increase conductivity, degrade insulation, and elevate the risk of RF exposure, worsening the chances of jump conduction.

Proper grounding of all metal roof components is crucial. It mitigates these risks, ensuring that electrical charges are safely directed away, reducing potential harm from both RF radiation and moisture-related complications.

A metal roof with solar panels 

Grounding a metal roof with solar panels requires special consideration to ensure safety and avoid electrical issues.

Use a licensed electrician

Because grounding solar panel systems on metal roofs can be complex, it’s recommended to have a qualified electrician or solar installer ensure your system is properly designed and grounded according to local regulations.

By carefully managing bonding, grounding, and protection against potential issues like lightning and corrosion, one can avoid many of the pitfalls associated with grounding a metal roof with solar panels. Always prioritize safety by adhering to electrical standards and consulting professionals where necessary.

Some of the information and writing in this post were refined with the help of ChatGPT, an AI language model developed by OpenAI.

Further reading – 2 informative posts

•Jeromy Johnson The Dark Side of Solar

 ” I advise that ES people completely avoid solar unless they have shielded wiring and can put the panels / inverter away from the home and professionally filter the AC line coming into the home” Jeromy Johnson

Copyright Jeromy Johnson October 2017 – Draft, All Rights Reserved https://www.emfanalysis.com/wp-content/uploads/2017/10/Dark-Side-of-Solar-Draft.pdf

•Hugo Schooneveld – Tips for the low-radiation purchase and installation of solar panels

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At night our bedrooms need to be a sanctuary, free of man made pollution such as EMF, light, noise, and chemical exposures.

Some diffusers use household power to operate and may potentially expose you to electric and magnetic fields when used in close proximity.

 As a precaution ensure that a minimum distance of 1 meter is kept between you, the electric wiring to the diffuser, and the diffuser itself.

The same advice applies to multiplugs, bedside lights and electric chargers.

For nightime a free and highly effective solution is to switch the power off (at the distribution board) to the bedroom.  This should include lighting circuits, as well as the adjacent rooms and any spaces directly below the bedroom.

A battery powered diffuser might be a better option.

Additionally, when using a diffuser, ensure the room is well-ventilated to maintain fresh air and prevent any buildup of essential oils that might cause irritation or discomfort.

By following these guidelines, one can minimize EMF exposure and create a more health-conscious sleeping environment.

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Abstract

A particular category of jewelry is one involving bracelets and necklaces that are deliberately made to contain naturally occurring radioactive material (NORM)—purveyors making unsubstantiated claims for health benefits from the release of negative ions. Conversely, within the bounds of the linear no-threshold model, long-term use presents a radiological risk to wearers. Evaluation is conducted herein of the radiological risk arising from wearing these products and gamma-ray spectrometry is used to determine the radioactivity levels and annual effective dose of 15 commercially available bracelets (samples B1 to B15) and five necklaces (samples N16 to N20). Various use scenarios are considered; a Geant4 Monte Carlo (Geant4 MC) simulation is also performed to validate the experimental results. The dose conversion coefficient for external radiation and skin equivalent doses were also evaluated. Among the necklaces, sample N16 showed the greatest levels of radioactivity, at 246 ± 35, 1682 ± 118, and 221 ± 40 Bq, for ²³⁸U, ²³²Th, and ⁴⁰K, respectively. For the bracelets, for ²³⁸U and ²³²Th, sample B15 displayed the greatest level of radioactivity, at 146 ± 21 and 980 ± 71 Bq, respectively. N16 offered the greatest percentage concentrations of U and Th, with means of 0.073 ± 0.0002% and 1.51 ± 0.0015%, respectively, giving rise to an estimated annual effective dose exposure of 1.22 mSv, substantially in excess of the ICRP recommended limit of 1 mSv/year.

https://www.mdpi.com/1660-4601/18/21/11170/htm

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