tag:blogger.com,1999:blog-11326364.post5930766757292954519..comments2024-03-12T05:05:15.167-04:00Comments on <center>CasesBlog - Medical and Health Blog</center>: What is the radiation exposure from full-body scans used for airport security screening?Unknownnoreply@blogger.comBlogger26125tag:blogger.com,1999:blog-11326364.post-10498122490316834982011-01-21T17:07:27.472-05:002011-01-21T17:07:27.472-05:00I am tired to hear just verbal assurances from num...I am tired to hear just verbal assurances from numerous experts that "it is safe". They should release the actual physical values of radiation exposure. And we (sufficiently educated and intelligent American public) will determine if it is safe or not.<br /><br />Commenting on a "millimeter wave" scanners - they may appear to be even more dangerous. The ultra short wave length radio waves produce a ionizing radiation upon penetration into hard matter (human bones in this case). So radiation will be delivered as close as possible to the vital organs...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-27185461433535700172010-09-14T19:29:44.924-04:002010-09-14T19:29:44.924-04:00This is my experience this Spring at Tampa airport...This is my experience this Spring at Tampa airport. Inspite of my request for patdown/body search (since I have been exposed to many medical xrays of the years) I was scanned with the new airport scanner.<br /><br />When sat in my seat about 1/2 hour later I noticed that I could not focus on text in the safety pamphlet.<br /><br />On the way to the airport I read the map as a navigator in the rent-a-car as my husband drove.<br />The inability to get full focus while reading lasted full 24hours , while my body craved chewable vitamin C with rutin...I found that a possible sideffect (cellular damage) could be to the capillaries - wonder if it happen to my eyes. I only use one eye for reading.<br /><br />I reported it to the flight attendant, because placating of the public is dime a dozen, but reports of adverse effects just a few.<br /><br />It took 43,000 dead people to pull Vioxx off the market...we need to know EVERY single adverse effect of the Frankenmachine.<br /><br />And speaking of the man with underware firecrackers - we watched on TV a couple who stood behind that man, and another man kept telling the security people that this young man <br />"has to be on that plane inspite of NOT HAVING a passport." That couple on TV said they reported this to the FBI and were waiting to hear from the FBI. Wonder what does the FBI think about it, and the security people who let HIM on that plane...Now all of us are being subjected to unnecessary x-rays.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-40749970187649256232010-03-04T09:42:31.364-05:002010-03-04T09:42:31.364-05:00This may be a document worth reviewing...
http://...This may be a document worth reviewing...<br /><br />http://dels.nas.edu/dels/rpt_briefs/beir_vii_final.pdf<br /><br />So if you take the dose from a single scan, convert the dose to risk (cancer mortality relative to dose, assuming LNT), then multiply that by the number of times people will be scanned, then you get an estimate of the mortality related to a program like this. I don't know. What about populations like pilots and crew, airport workers (scanned daily? 5 times/week? 50 weeks/year?), and frequent flyers?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-21418841092329820452010-02-09T15:55:48.171-05:002010-02-09T15:55:48.171-05:00I will refuse any form of radiation scanning at an...I will refuse any form of radiation scanning at an airport. I have had enough X-rays and radio waves that I could not avoid. If they want to pull me into a room to search, so be it. If they demand I be scanned or I cannot fly, then I will never fly again.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-75205018088740796602010-01-20T02:20:38.509-05:002010-01-20T02:20:38.509-05:00"it is the cellular damage (and death) due to..."it is the cellular damage (and death) due to ionising radiation [that] is cumulative."<br /><br />Yes, indeed. But what you are saying is that the risk is cumulative.Mattnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-37854548873523570582010-01-17T05:49:18.098-05:002010-01-17T05:49:18.098-05:00"... radiation doses grow to become more and ..."... radiation doses grow to become more and more harmful and keep accumulating ..."<br /><br />Ionising radiation from an external source (e.g. CT, x-ray machine) does not remain in the body for minutes, hours or days and hence, there is not cumulative dose. The energy is transferred to a cellular electron where it has an immediate effect. The measured cumulative exposure over a lifetime is a different thing. Particles that emit ionising radiation that are ingested, inhaled or injected (e.g. nuclear medicine bone scan using technetium, treatment for a thyroid disorder using an iodine isotope) decay over time, usually a matter of hours.<br /><br />The effects of externally created and delivered ionising radiation, such as that from a CT or x-ray machine are immediate. It is the cellular damage (and death) due to ionising radiation is cumulative. Hope this clarifies things.Watersheddhttps://www.blogger.com/profile/05806629331225277927noreply@blogger.comtag:blogger.com,1999:blog-11326364.post-75681747983380434742010-01-07T15:30:40.641-05:002010-01-07T15:30:40.641-05:00There is no ionizing (e.g. proven "harmful&qu...There is no ionizing (e.g. proven "harmful") radiation with "millimeter wave" (radio wave) full-body scanners... <br /><br />Go through those if you have a choice.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-7244447499209592102010-01-07T15:25:52.616-05:002010-01-07T15:25:52.616-05:00"But then I have the advantage of a very info..."But then I have the advantage of a very informed perspective, something the general public do not."<br /><br />and you say you work with radiation for a living? well then you of all people should know that radiation doses grow to become more and more harmful and keep accumulating onto the last time you took in radiation. So if you decide to travel lets say from Hawaii to long island and then back and lets just assume your the average american in todays society so you probably dont have enough money to fly direct. How many flights are you going to have to get on to get there and back? how much radiation would that be to add to what you might already have? how can you say, as some sort of radiation worker, that these scans dont seem too harmful?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-17051057266203833412010-01-07T15:16:16.139-05:002010-01-07T15:16:16.139-05:00"I'll take my chances in the pat down lin..."I'll take my chances in the pat down line"<br />lucky for you that there may still be one where you live, in a lot of airports it is now mandatory to use the scan and you cannot board a flight without one all because of the oh so perfectly timed incident with the man who somehow...i repeat SOMEHOW GOT ON BOARD AN AIRPLANE WITH FIRECRACKERS IN HIS UNDERWEAR, this is impossible and as a result the ridiculous, insulting, and ludacris solution of naked body scans have been enacted. Which i remind you can cause skin cancer and there are now websites up that somehow got a hold of some of the images and now use them on there sites for "entertainment". i call that a violation of privacy and some would go as far to even call it unconstitutional. i think these scans are bull and need to be taken out of airports. i also think if the airlines don't to listen and decide to keep them, like some are doing now, then we should boycott. sell your stocks in there company until it either forces them to get rid of the scans or they will go bankrupt. Either way i feel it would be better for everybody to not worry about whether some creep is saving a picture of there naked body or if they are going to get skin cancer every time they need to go to the airport.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-51891041008217377002010-01-06T09:46:51.720-05:002010-01-06T09:46:51.720-05:00"isn't an easier and cheaper solution to ..."isn't an easier and cheaper solution to all of this a trained dog at the airport?"<br /><br />No.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-30438392675997818462010-01-06T01:23:11.708-05:002010-01-06T01:23:11.708-05:00isn't an easier and cheaper solution to all of...isn't an easier and cheaper solution to all of this a trained dog at the airport?Derrick Lnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-86619685366047412702010-01-05T21:34:23.017-05:002010-01-05T21:34:23.017-05:00What would a wet menstual pad look like? What wou...What would a wet menstual pad look like? What would a colostomy bag look like? I see the potential for a lot of embarrassing time-wasting body searches. Meanwhile the terrorists will hide explosives in body cavities, fly on domestic flights, and detonate in the first hour of the flight.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-53367318390513126682010-01-05T11:24:42.232-05:002010-01-05T11:24:42.232-05:00"Aren't cellphones being investigated as ..."Aren't cellphones being investigated as a link to brain cancer because of the RF exposure?"<br /><br />No evidence in the current studies.<br /><br />"And isn't there some concern that sunscreen ingredients might be converting to free radicals when exposed to radiation?"<br /><br />There was something like that in the news a few months ago. Nothing definitive though.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-18323700387818436112010-01-05T11:02:57.563-05:002010-01-05T11:02:57.563-05:00Wait. Aren't cellphones being investigated as ...Wait. Aren't cellphones being investigated as a link to brain cancer because of the RF exposure?<br /><br /><i>It will be interesting to see if skin cancers increase if this technology becomes the norm.</i><br /><br />And isn't there some concern that sunscreen ingredients might be converting to free radicals when exposed to radiation? Or being a catalyst, in the case of micronized titanium dioxide.votermomhttp://www.votermom.blogspot.comnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-25522704982957828692010-01-02T10:45:45.803-05:002010-01-02T10:45:45.803-05:00Thank you for your excellent comment, Watershedd!Thank you for your excellent comment, Watershedd!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-6675893952270202552010-01-02T05:46:53.307-05:002010-01-02T05:46:53.307-05:00My background is in medical radiations. Radiation ...My background is in medical radiations. Radiation workers are provided with radiation monitors to wear that detect exposure to X and gamma rays. Whilst the damage caused by this type of ionising radiation is instantaneous, the longer term effects are unpredictable. Scattered radiation from an x-ray is considered to be quite destructive to both image quality and cellular health, which is why patients in hospitals who are exposed to frequent x-rays (e.g. intensive care, daily chest x-rays for weeks) should be covered with lead to absorb the scatter before it reaches organs outside the field of view, such as the gonads. Now with that in mind, if you travel frequently between cities (I have a brother who flies between two cities within Europe almost weekly), I would be concerned about the amount of cellular damage to skin, subcutaneous tissues and testes by such regular ionising exposure. It will be interesting to see if skin cancers increase if this technology becomes the norm.<br /><br />Radio-frequency exposure is measured as both estimated and total specific absorption rates (SAR), as used for MRI scans. (When talking about portion of the electromagnetic spectrum, the actual exposure and that absorbed by the body are different.) Pregnant women may undergo an MRI, but are generally advised that if they can wait beyond the first trimester, that this is preferable. Pregnant staff are advised not to remain in the scan room during image acquisition (when the RF is on). I do not allow my pregnant staff to remain in the room during scanning. I would not do so myself.<br /><br />Patients with pacemakers have been known to encounter problems with RF units at shop entrances and I would expect that the same could be expected for a small number with the millimeter wave scanners. Just as an aside, there are many other electronic devices implanted in patients for all manner of disorders that are not dissimilar to pacemakers (Deep brain stimulators for Parkinson's is an example, although I've not heard of issues with them). If you are not pregnant and don't have a electronically operated device implanted somewhere in your body, I see no problem with this scanner. I'd readily do so at any airport. But then I have the advantage of a very informed perspective, something the general public do not.Watersheddhttps://www.blogger.com/profile/05806629331225277927noreply@blogger.comtag:blogger.com,1999:blog-11326364.post-91757589910660627432009-12-31T16:07:49.951-05:002009-12-31T16:07:49.951-05:00Re: "It uses electromagnetic waves" - th...Re: "It uses electromagnetic waves" - the author should done their homework before writing this, all radiation is electromagnetic waves!"<br /><br />Good joke :) <br /><br />Of course, all Electromagnetic waves = Electromagnetic radiation. It's the same with heat radiation, even body heat radiation.<br /><br />This is not what we usually have in mind when we talk about radiation, of course.<br /><br />Just check Wikipedia for a start before posting comments:<br /><br />http://en.wikipedia.org/wiki/Electromagnetic_radiation<br /><br />http://en.wikipedia.org/wiki/Thermal_radiationAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-77955187175571713972009-12-31T16:01:49.823-05:002009-12-31T16:01:49.823-05:00If 10uRem is the radiation exposure from a single ...If 10uRem is the radiation exposure from a single scan, this is a very low and safe level. How do we know each machine is emitting the same amount of radiation? How do we know the machine is working correctly? I would like to know what the maximum radiation exposure would be if the machine is not working as intended. Then I would decide if the benefits outweigh the risk...<br /><br />What if the traveller moves (cough, sneeze, parkinsons) during the scan? Does it have to be repeated? How many times can a "screener" repeat the scan before considering radiation exposure?<br /><br />I doubt the "screeners" have the technical ability to perform QC on scanning/Xray equipment to ensure public safety. Unless there is a CHP or other radiation professional analyzing the QC data count me out! I'll take my chances in the pat down lineAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-1407127847810811962009-12-31T13:21:12.565-05:002009-12-31T13:21:12.565-05:00"millimeter wave" machine, doesn't u..."millimeter wave" machine, doesn't use radiation. It uses electromagnetic waves" - the author should done their homework before writing this, all radiation is electromagnetic waves! Should have said this is non-ionizing radiation.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-45154420401599444352009-12-31T12:21:28.156-05:002009-12-31T12:21:28.156-05:00"The same people who think H2O is water, refi..."The same people who think H2O is water, refined sugar is the same as natural sugar..."<br /><br />--<br /><br />I'm not sure I get your point....Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-78089166495140429442009-12-31T12:17:40.753-05:002009-12-31T12:17:40.753-05:00Who said that the rays of the sun are the same as ...Who said that the rays of the sun are the same as radiowaves? The same people who think H2O is water, refined sugar is the same as natural sugar, mineral iron is the same as the iron in plants (and therefore mineral supplement iron is the same as plant supplement iron)... Don't you think there's a bit of a convenient assumption going on here?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-56243614000822518742009-12-30T21:13:28.363-05:002009-12-30T21:13:28.363-05:00Re: "It is also misleading to state that '...Re: "It is also misleading to state that 'a "millimeter wave" machine, doesn't use radiation."<br /><br />You can't be serious.<br /><br />How do you measure the radiation induced by radio waves then?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-86454150188829982562009-12-30T20:10:01.625-05:002009-12-30T20:10:01.625-05:00John is correct, these discussions need to be plac...John is correct, these discussions need to be placed in context, and the blog does not merely quote experts. His analogy is also correct, although that does not mean that the technology is dangerous, merely that it is not enough simply to look at total energy output. A person's history of exposure is also relevant, but that applies to air travellers generally (as the blog aptly points out).<br /><br /> It is also misleading to state that 'a "millimeter wave" machine, doesn't use radiation. It uses electromagnetic waves'. X-Rays are also electromagnetic waves, as is all light. There is no mention of the health effects of millimeter wave machines, but it has been known for a long time that exposure to powerful radio sources can be dangerous, and there is some evidence that weak radio sources may have health implications, but this is not proven. This may not be a very powerful radio source, but we should know.<br /><br />Air travel will always be more dangerous than a scan, but that's not the point.Mattnoreply@blogger.comtag:blogger.com,1999:blog-11326364.post-3837499160485416992009-12-30T17:37:09.617-05:002009-12-30T17:37:09.617-05:00More importantly, how does the millimeter wave sca...More importantly, how does the millimeter wave scanners (which use electromagnetic wave) affect a pacemaker? We're warned to stay away from metal detectors and hand wands because the magnets involved can affect a pacemaker.SteveChttps://www.blogger.com/profile/03302771359864536384noreply@blogger.comtag:blogger.com,1999:blog-11326364.post-35974589892907562092009-12-30T12:02:26.661-05:002009-12-30T12:02:26.661-05:00John,
I don't think the discussion is mislead...John,<br /><br />I don't think the discussion is misleading. The blog post does not make any claims but simply quotes some of the leading experts in the field.<br /><br />Comparing blow torch to X-ray however can be misleading from a scientific perspective.Anonymousnoreply@blogger.com