Sponsored Content




Intermarkets' Privacy Policy
Support


Donate to Ace of Spades HQ!



Recent Entries
Absent Friends
Bandersnatch 2024
GnuBreed 2024
Captain Hate 2023
moon_over_vermont 2023
westminsterdogshow 2023
Ann Wilson(Empire1) 2022
Dave In Texas 2022
Jesse in D.C. 2022
OregonMuse 2022
redc1c4 2021
Tami 2021
Chavez the Hugo 2020
Ibguy 2020
Rickl 2019
Joffen 2014
AoSHQ Writers Group
A site for members of the Horde to post their stories seeking beta readers, editing help, brainstorming, and story ideas. Also to share links to potential publishing outlets, writing help sites, and videos posting tips to get published. Contact OrangeEnt for info:
maildrop62 at proton dot me
Cutting The Cord And Email Security
Moron Meet-Ups

NoVaMoMe 2024: 06/08/2024
Arlington, VA
Details to follow


Texas MoMe 2024: 10/18/2024-10/19/2024 Corsicana,TX
Contact Ben Had for info





















« Leslie Nielsen, Dead at 84 [rdbrewer] | Main | The Walking Dead: Episode 5 "Wildfire" »
November 29, 2010

Biochemist Raises Questions about Nude-o-Scopes [rdbrewer]

Jason Bell, a biochemist working in biophysics.


Chromosome Damage From Radiation

On the significance of the type of radiation used:

The TSA has been stating that the X-rays used in the back scatter machines use 'soft' X-rays, which are defined as radiation between 0.12-12 keV (or kilo electron volts) and are generally stopped, or absorbed, by soft tissue or low density matter. 'Hard' X-rays are between 12-128 keV and are absorbed by dense matter like bone. According to the TSA safety documents, AIT uses an 50 keV source that emits a broad spectra (see adjacent graph from here). Essentially, this means that the X-ray source used in the Rapiscan system is the same as those used for mammograms and some dental X-rays, and uses BOTH 'soft' and 'hard' X-rays. Its very disturbing that the TSA has been misleading on this point. Here is the real catch: the softer the X-ray, the more its absorbed by the body, and the higher the biologically relevant dose! This means, that this radiation is potentially worse than an a higher energy medical chest X-ray.

(Emphasis mine.) He has several concerns about the power of the machines in question:

  • Based on the limited engineering schematics released in the safety documents, the machines could be easily reconfigured to perform through-the-body X-rays, and the hardware has the capability to output high doses of radiation though failure or both authorized and unauthorized reconfiguration of software and hardware.
  • The X-ray beam is being rastered across the body--that is, scanned in lines from side to side, top to bottom, like a TV screen. If the machine fails or gets stuck during a pass, there is a possibility a person's eye, testicle, or hand, for example, could receive a dangerous dose of X-rays.
  • This possibility gives rise to certain questions: What is the failure rate of these machines? What is the failure rate in an operational environment? Who services the machine? What is the decay rate of the filter? What is the decay rate of the shielding material?
  • Also, what is the variability in the power of the X-ray source during the manufacturing process? The Johns Hopkins Applied Physics Laboratory noted a significant disparity in their test models--which were supposed to be adjusted to exact specifications.

On the widely publicized claim that radiation from the machines amounts to the same exposure one would receive after two to three minutes of flight:

With respect to errors in the safety reports and/or misleading information about them, the statement that one scan is equivalent to 2-3 minutes of your flight is VERY misleading. Most cosmic radiation is composed of high energy particles that passes right through our body, the plane and even most of the earth itself without being absorbed or even detected. The spectrum that is dangerous is known as ionizing radiation and most of that is absorbed by the hull of the airplane. So relating non-absorbing cosmic radiation to tissue absorbing man-made radiation is simply misleading and wrong.

Much more at the link, including questions raised by scientists about the lack of testing and safety data provided by the government and/or the manufacturers and the lack of independent testing and data. He also points out how stingy the release of information has been, with many things redacted in the material that has been made available. Why?

Link via BoingBoing.


digg this
posted by Open Blogger at 12:01 AM

| Access Comments




Recent Comments
[/i][/b]andycanuck (2yu8s)[/s][/u]: "750-pound alligator seized from home near Buffalo, ..."

Ben Had: "Only 30 more years of these moronic statements ft ..."

2008 is calling: "Mahalia Jackson>>>>>>>>>>>Affimative Action Jackso ..."

BillyD: "[i]158 Mind you, a Moron claimed the car would sti ..."

Diogenes: "DEI in action, and that's a good thing! Posted by ..."

Piper: "Have we discussed KBJ and her gripe the 1sr amendm ..."

Commissar Hrothgar (hOUT3) ~ This year in Corsicana - [b]again[/b]! ~ [/i][/b][/u][/s]: "[i]257 Watching another Boeing United Airlines iss ..."

Loose Emergency Door Plug: "Return to Newark? I'd rather ditch. Posted by: D ..."

J. Random UA Flight: "[i]Return to Newark? I'd rather ditch. Posted by ..."

Diogenes: "Watching another Boeing United Airlines issue in r ..."

Truthbomb : "Watching another Boeing United Airlines issue in r ..."

Ciampino - on time: "About 43 minutes [b]SpaceX - Falcon 9 - Starlin ..."

Recent Entries
Search


Polls! Polls! Polls!
Frequently Asked Questions
The (Almost) Complete Paul Anka Integrity Kick
Top Top Tens
Greatest Hitjobs

The Ace of Spades HQ Sex-for-Money Skankathon
A D&D Guide to the Democratic Candidates
Margaret Cho: Just Not Funny
More Margaret Cho Abuse
Margaret Cho: Still Not Funny
Iraqi Prisoner Claims He Was Raped... By Woman
Wonkette Announces "Morning Zoo" Format
John Kerry's "Plan" Causes Surrender of Moqtada al-Sadr's Militia
World Muslim Leaders Apologize for Nick Berg's Beheading
Michael Moore Goes on Lunchtime Manhattan Death-Spree
Milestone: Oliver Willis Posts 400th "Fake News Article" Referencing Britney Spears
Liberal Economists Rue a "New Decade of Greed"
Artificial Insouciance: Maureen Dowd's Word Processor Revolts Against Her Numbing Imbecility
Intelligence Officials Eye Blogs for Tips
They Done Found Us Out, Cletus: Intrepid Internet Detective Figures Out Our Master Plan
Shock: Josh Marshall Almost Mentions Sarin Discovery in Iraq
Leather-Clad Biker Freaks Terrorize Australian Town
When Clinton Was President, Torture Was Cool
What Wonkette Means When She Explains What Tina Brown Means
Wonkette's Stand-Up Act
Wankette HQ Gay-Rumors Du Jour
Here's What's Bugging Me: Goose and Slider
My Own Micah Wright Style Confession of Dishonesty
Outraged "Conservatives" React to the FMA
An On-Line Impression of Dennis Miller Having Sex with a Kodiak Bear
The Story the Rightwing Media Refuses to Report!
Our Lunch with David "Glengarry Glen Ross" Mamet
The House of Love: Paul Krugman
A Michael Moore Mystery (TM)
The Dowd-O-Matic!
Liberal Consistency and Other Myths
Kepler's Laws of Liberal Media Bias
John Kerry-- The Splunge! Candidate
"Divisive" Politics & "Attacks on Patriotism" (very long)
The Donkey ("The Raven" parody)
Powered by
Movable Type 2.64