/ehs/taxonomy/term/17/all en /ehs/laboratory/radiation/introduction <div class="two-column-1"> <div> <p style="text-align:left">The atom can be thought of as a system containing a positively charged nucleus and negatively charged electrons which are in orbit around the nucleus.</p></div></div> Tue, 28 Jun 2011 16:22:18 +0000 admin 165 at /ehs /ehs/laboratory/radiation/radiation-units <ul> <li><b>Activity</b> is the transformation (disintegration) rate of a radioactive substance <ul> <li>Curie (Ci)</li> <li>Becquerel (Bq) - S.I. Unit <p>1 Bq = 1 disintegration per second (dps)<br /> 1 Ci = 3.7 x 10<sup>10</sup> dps<br /> 1 Ci = 3.7 x 10<sup>10</sup> Bq</p> </li> <li><b>Absorbed dose</b> is a physical quantity which represents the energy imparted by radiation onto an absorbing material. <ul> <li>Rad</li> <li>Gray (Gy) - SI Unit <p>1 Gy = 1 joule per kilogram<br /> 1 Gy = 100 rads</p></li></ul></li></ul></li></ul> Tue, 28 Jun 2011 16:22:03 +0000 admin 135 at /ehs