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nock Member Profile  Member Since: 2009-11-30 Last Power Points used: 2010-12-13 • Available: now Max Power Points: 1 • Get More Power Points Now Comments |
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Member Stats Rank: 287 Rating:  60 star pointsTop 15 Videos: 9 Votes Received: 2029 Average Votes Per Video: 17.34 Votes Cast: 267 Comments Posted: 187 • browse Comments Applauded: 4 Sifted Videos: 60 Sift Talk Posts: 2 Profile Views: 15786 Highest Ranked Comments Member's Highest Rated Videos | ||
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Election Videos Submitted by nock
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I'd be 99.5% sure they bought it from the U.S. though (looked it up, it was discovery channel).
In reply to this comment by nock:
Really? There's a show called "When Pilots Eject"?
500 channels and nothing's on.
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but not my number 1 issue at the moment. i'm waffling around with which issue is number 1.
oops sorry, didnt mean to to make this a profile reply.
In reply to this comment by nock:
So we're saying the same thing...? That these are potentially harmful?
>> ^peggedbea:
you're right. the kvp of a scout film is certainly higher than these images. these images will not penetrate as deeply into the body, but scout films aren't (usually) directed at the entire body. also, at a smaller kvp you get a greater amount of backscatter because the dose isn't strong enough to penetrate the body. backscatter is the reason radiology techs stand behind lead walls, wear lead aprons, and wear dosimeters. and the reason radiology techs who have had cancer are generally taken off the floor and become managers.
>> ^nock:
These scans are different from scout films for CT scanners. Scout films are basically chest xrays. They use Xrays with keV that penetrate tissues. My understanding of these scanners is that the total body radiation may be less, but the amount of surface (read: skin/eyes/testicles) radiation is increased because of the simple fact that the keV is smaller, which explains the UCSF letter regarding concerns for AIDS/cancer patients and the elderly/young. Medical physicists and radiologists are taught very early on that with regard to ionizing radiation, there is no level of exposure at which the risk of harmful biological effects is zero. Until peer-reviewed evidence is provided to suggest otherwise, these scanners should be considered potentially harmful.
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