- #1
Aeronautic Freek
- 121
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Why SAR value at body is allways higher than at head?
Specific Absorption Rate(SAR) - caused from radio frequency from mobile phones
- Thread starter Aeronautic Freek
- Start date
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Discussion Overview
The discussion centers around the Specific Absorption Rate (SAR) related to radio frequency exposure from mobile phones, particularly focusing on why SAR values are typically higher at the body compared to the head. Participants explore definitions, implications for safety, and share references for further information.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Meta-discussion
Main Points Raised
- Some participants inquire about the definition of SAR and its significance.
- One participant suggests that the higher SAR value at the body compared to the head may be due to the impedance mismatch caused by the skull bone, which reflects more energy than the soft tissues elsewhere.
- Another participant notes that SAR is an important variable in assessing the safety of MRI scanners.
- Several participants request references to support claims regarding SAR values and specifications.
- There are discussions about navigating links to SAR data, with some participants expressing confusion over the presentation of information on specific websites.
- One participant describes the challenges of sharing screenshots and images within the forum.
Areas of Agreement / Disagreement
Participants express varying levels of understanding regarding SAR, with some agreeing on the technical aspects while others seek clarification. The discussion remains unresolved regarding the specific reasons for differences in SAR values at different body parts.
Contextual Notes
Participants have not reached a consensus on the reasons behind the differences in SAR values, and there are ongoing requests for clarification and additional resources. Technical issues related to web navigation and sharing information also arise.
Who May Find This Useful
Individuals interested in mobile phone safety, radio frequency exposure, and those studying or working in fields related to physics, engineering, or medical imaging may find this discussion relevant.
- #2
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SAR, what is that?
- #3
Aeronautic Freek
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Specific Absorption Rateanorlunda said:
- #4
Baluncore
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The poor impedance match due to the layer of skull bone reflects more energy than the soft tissues on other parts of the body that have only internal bones.Aeronautic Freek said:
- #5
berkeman
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Link to a reference please...Aeronautic Freek said:
- #6
gleem
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SAR is an important variable in assessing the safety of MRI scanners and may affect how MRI studies are implemented.
https://radiopaedia.org/articles/specific-absorption-rate?lang=us
https://radiopaedia.org/articles/specific-absorption-rate?lang=us
- #7
Aeronautic Freek
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https://www.devicespecifications.com/en/model-sar/5b6252a4berkeman said:
- #8
berkeman
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I don't get it. The link seems to show general specs, not a specific SAR number?Aeronautic Freek said:
- #9
Tom.G
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@berkeman
https://www.devicespecifications.com/en/model-sar/5b6252a4
You may have to click on the SAR tab, then scroll down.
(at least it works here)
https://www.devicespecifications.com/en/model-sar/5b6252a4
You may have to click on the SAR tab, then scroll down.
(at least it works here)
- #10
berkeman
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Thanks. I missed the SAR tab (duh), but clicking on it does not take me away from the general specs tab. Firefox on Win10 here.Tom.G said:
Can you post a screenshot of the SAR tab? Thanks.
- #11
Tom.G
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The SAR tab has 8 tables/graphs, if you haven't tried scrolling down after hitting the SAR tab, please try it. The spec. page stays there but the other tabs append to the that same spec. page. (That page acts like a cover letter.)
PF ignores my attempts to paste an image. I have to screen-grab, paste into a graphics pgm., save as a file, upload file; rather tedious. I'm willing if needed, but hoping you can get/retrieve it. Let me know.
(Firefox 43 on Win XP)
Cheers,
Tom
PF ignores my attempts to paste an image. I have to screen-grab, paste into a graphics pgm., save as a file, upload file; rather tedious. I'm willing if needed, but hoping you can get/retrieve it. Let me know.
(Firefox 43 on Win XP)
Cheers,
Tom
- #12
berkeman
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Got it now, thanks!Tom.G said:
That's likely the issue. You'd need a more modern OS to get the simpler paste feature, probably.Tom.G said:
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