Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
1Gy (dose of one Gray) is when 1 kg of body tissue absorbs
1 joule of energy. The older unit of dose, 1 rad, is the same as
0.01 Gy or 10 mGy.
For x rays one can assume that 1 rem=1 rad (or 1 Sv = 1 Gy).
Therefore:
Dental bitewing (4 films) 0.038 milisievert (mSv) --> ?
0.038 mSv = 0.038 mGy = 0.0038 rads = 3.8 mrads = 3.8 mrem
or roughly 1 mrem per film. In other words, what we receive from
this 4-films procedure is about 2% of what every part of our body
receives in one year from the environment. I am assuming the yearly
dose is 200 mrem. Brian quoted (see below) the average yearly
dose of 3600 mSv (360 mrad). This probably accounts for medical
treatments. Right? Otherwise 360 is about two times larger than what
is usually printed for the so-called "natural background."
Ludwik wrote:
1Gy (dose of one Gray) is when 1 kg of body tissue absorbs
1 joule of energy. The older unit of dose, 1 rad, is the same as
0.01 Gy or 10 mGy.
For x rays one can assume that 1 rem=1 rad (or 1 Sv = 1 Gy).
Hence 1Gy = 100 rad = 100 rem = 1Sv for Ludwik's assumptions.
/snip/
Brian quoted (see below) the average yearly
dose of 3600 mSv (360 mrad).
/snip/
Ludwik Kowalski
I did not! 3600mSv = 360 rem. Cockroaches maybe, humans no.
I expect Ludwik had 3600 uSv in mind.