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To: UpAllNight

Sorry. You're information on this seems to be in error. The following (where measurements are in Sv - which is strictly DOSE measurement) is from Adani's website, a maker of medical XRay devices, and again we don't have to worry about mixed units:

"Dose equivalent is a quantity that takes into account "radiation quality" which relates to the degree in which a type of ionizing radiation will produce biological damage. Not all radiation has the same biological effect, even for the same amount of absorbed dose. The Dose equivalent is obtained by multiplying the Absorbed dose by a Quality Factor. The resulting quantity can then be expressed numerically in Sieverts (Sv, 1 Sv = 1 J/kg)..."
http://www.adani.by/prod_securpersonal_xray.php

Radiation source........ Effective dose
X-ray tomography of head 50,000 µSv (max.)*, 10,000(typical)
Dental X-ray radiography: 5,000 µSv (max.)*,. 1,000(typical)
Chest X-ray radiography:... 400 µSv (max.)*,... 100(typical)

Since 1mSv=100mrem, dental XRay = 100-500mrem biological dose to the tissue.

I'm going on to my Christmas weekend, and have really lost interest in this, since the baby will be just fine getting zapped by the screening machine. Please feel free to take this up with Adani and UVM if you like, and if you dispute their dosage figures for dental XRays.


77 posted on 12/22/2006 1:10:03 PM PST by AFPhys ((.Praying for President Bush, our troops, their families, and all my American neighbors..))
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To: AFPhys

You should have posted the next paragraph:

Effective dose

Different tissues (or body parts) are not equally sensitive to a kind of radiation. That is, if the entire body were irradiated with uniform beam of a single type of radiation, some parts of the body would react more dramatically than others. The effective dose to an individual is calculated as a weighted average of the dose equivalent to different body tissues by using Tissue Weighting Factors designed to take into account different tissue contributions to overall effective biological damage to the body. Effective dose is used as a measure of the likelihood of stochastic effects of radiation exposure: carcinogenesis and hereditary effects. The SI unit of Effective dose is Sievert.

The effective dose is important to estimate the biological effect of irradiation but it cannot be measured directly with any instrument. A sophisticated thorough study using an anthropomorphic human body phantom was performed to estimate the typical effective doses received by the individuals from DRS SecureScan. The results of this study were described in the report (Department of Radiology of Long Island Jewish Medical Center (New York), report "Radiation Evaluation for the CONPASS Body Scanner", 06/21/2002). All data related to the DRS SecureScan effective doses are based on the above mentioned report.


78 posted on 12/22/2006 1:13:54 PM PST by UpAllNight
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To: AFPhys

--Please feel free to take this up with Adani --

I prefer not to take it up with some Russian company that cannot meet US standards for their machine.


79 posted on 12/22/2006 1:28:29 PM PST by UpAllNight
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