By David Reed Greenwood; G L Kingsbury; J G Cleland; United States. Environmental Protection Agency. Office of Research and Development
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Additional info for A handbook of key federal regulations and criteria for multimedia environmental control
2 mGy - 10 Gy (20 mrad-1000 rad). 2 mGy are not reliably measurable, they are not reported in the Radiation Protection Bureau system. Also, low energy Beta particles, such as those emitted by 3H for example, will not penetrate even the thin mylar window of the dosimeter, and are therefore not detected by it. Betas from 14C are sufficiently energetic to just penetrate the window, but activities of 14C high enough to generate a significant reading are rarely used in radionuclide laboratories. As well as keeping track of names and plaque numbers for dosimeters undergoing readout, the computer system also stores records of each individual's accumulated dose to date in a database called "The National Dose Registry�.
M. tube is often in the form of a cylindrical probe connected to the main instrument case by an electrical cord. The outer tube is the cathode, and the anode is a thin wire running down the centre. side window end window pancake Portable �·� �onitor Batteries provide power to generate tube voltage and operate the electronics. Counts per minute can be read off a meter in several switch-selectable ranges, and a slow or fast needle response is usually available by switching in more or less electronic smoothing of the tube output.
Radiation Safety Officer's Handbook scattered photon incoming photon Compton scatter recoiling electron The third process, pair production, is the reverse of the electron/positron annihilation described before: the photon energy is used to create an electron and a positron. 11 x 10-31 kg), and of course, the same amount for a positron. 022 MeV of energy. Any photon energy left over after the mass creation, is divided randomly between the electron and positron. The energy lost by the original photon is transferred to the target electron, which leaves its parent atom and itself becomes an ionizing particle.
A handbook of key federal regulations and criteria for multimedia environmental control by David Reed Greenwood; G L Kingsbury; J G Cleland; United States. Environmental Protection Agency. Office of Research and Development