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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:
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. | Recent Comments
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Wednesday Overnight Open Thread - April 9, 2025 [TRex]
Parental Cafe Federal Judges Block Deporations... Again S&P Posts Its Biggest One-Day Gain In History as Markets Rally Plus: Is China "In a Box"? Of Course: The US Knew That Seven American Troops Contracted Covid-19 at the Wuhan Games in 2019, But Covered It Up to Protect Hunter Biden's Business Partners in China White House Stops Responding to "Journalists" With Pronouns In Their Email Signature Lines Trump Builds the China Tariff Wall Ten Feet Higher While Announcing a "Pause" on Tariffs for Other Countries; Markets Soar Texas AG Ken Paxton Announces Challenge to Supercuck RINO John Cornyn Open Thread Wednesday Morning Rant Search
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