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                                                        DR. DAN PETERSON

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X-RAY SAFETY UPDATE

We use every precaution to protect you

X-Ray dosages 
from the GenR8TNext newsgroup by Dr. Bruce Murphy

The following exposures of bone marrow to radiation during typical
x-ray examinations are listed below in millirems, a measurement of
radiation.

The maximum on the job yearly exposure for Canadian and U.S.
radiation workers has been set at 5,000 millirems.  Low doses spread
out over a period of time are not as harmful as larges doses at once
because the body has time to recover.

HIGH DOSE GROUP
   Barium enema: lower GI series        875
   Pelvimetry: examination to evaluate
   proportions of the birth canal       595
   Barium meal: upper GI series         535
   Mammography: breast examination     1000
   Lumbrosacral spine (lower spine)     450
   Small bowel series                   422
   IV pyelogram                         420
   Lumbar spine                         347
   Thoracic spine                       247

MEDIUM DOSE GROUP
   Gallbladder             168
   Abdomen                 147
   Ribs                    143
   Pelvis                  133
   Skull                    78
   Hip                      72

LOW DOSE GROUP
   Cervical spine (neck)      52
   Femur (upper leg)          21
   Dental (full mouth series)  9
   Dental (panorex)            1
   Dental (bitewing)          0.5

You would have to take 1750 dental x-rays to equal the radiation in a
lower GI series! 1 dental x-ray is 1/10000 of the yearly maximum
recommended dose. To put things in perspective, each time you fly
from coast to coast you receive 4 millirems of background radiation,
or the equivalent of four panoramic radiographs
. As well, there is
background radiation from concrete buildings, roads and even the sun!
Just standing around you receive more than 3 bitewing x-rays worth of
radiation every day
. In fact several researchers have published
papers indicating that low level doses of radiation actually reduce
cancer risks.

We would have to take almost 10,000 dental x-rays to reach your
maximum safe yearly dose!

When you weigh this against all the serious conditions such as decay,
periodontal disease, abscesses and cancer that can go undetected
without x-rays, it seems like a pretty fair tradeoff.

February 06, 2008  

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PLEASE NOTE: The information contained herein is intended for educational purposes only.  It is not intended and should not be construed as the delivery of dental/medical care and is not a substitute for personal hands on dental/medical attention, diagnosis or treatment.  Persons requiring diagnosis, treatment, or with specific questions are urged to contact your family dental/health care provider for appropriate care.
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