Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A
Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A
Understanding Neutron Radiography Post Exam Reading VIII-Part 2a of 2A
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REM (Roentgen equivalent man) – Dose Equivalent<br />
One <strong>of</strong> the two standard units used to measure the dose equivalent (or<br />
effective dose), which combines the amount <strong>of</strong> energy (from any type <strong>of</strong><br />
ionizing radiation that is deposited in human tissue), along with the medical<br />
effects <strong>of</strong> the given type <strong>of</strong> radiation. For beta and gamma radiation, the dose<br />
equivalent is the same as the absorbed dose. By contrast, the dose<br />
equivalent is larger than the absorbed dose for alpha and neutron radiation,<br />
because these types <strong>of</strong> radiation are more damaging to the human body.<br />
Thus, the dose equivalent (in rems) is equal to the absorbed dose (in rads)<br />
multiplied by the quality factor <strong>of</strong> the type <strong>of</strong> radiation [see Title 10, Section<br />
20.1004, <strong>of</strong> the Code <strong>of</strong> Federal Regulations (10 CFR 20.1004), "Units <strong>of</strong><br />
Radiation Dose"]. The related international system unit is the sievert (Sv),<br />
where 100 rem is equivalent to 1 Sv. For additional information, see Doses in<br />
Our Daily Lives and Measuring Radiation.<br />
先 有 rad 才 有 rem / 先 有 Gray 才 有 Sievert<br />
Charlie Chong/ Fion Zhang<br />
http://www.nrc.gov/reading-rm/basic-ref/glossary/rem-roentgen-equivalent-man.html
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