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Results for “RADIATION PROTECTION”

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At least 865 records · Page 48Linked to original sources
PubMed2004

The radiation field characteristics of a 137Cs source used for calibration of radiation protection instruments.

In this work, an experimental study of the radiation beam characteristics of the photon beams produced by commercial irradiator that uses a single collimated 137Cs source is performed. A set of lead attenuators are placed at the exit window of the irradiator to vary the air Kerma that is required to cover the instrument scales at a particular calibration distance. The results strongly enhance the findings of previous studies that a single source with appropriate attenuation and collimation is a practical solution for calibration laboratories with an acceptable overall accuracy.

Brazil↗
PubMed1992

Radiation protection design for a clinical positron emission tomography imaging suite.

Radiation exposures due to patient sources, a pneumatic transport system, and gas lines in a positron emission tomography imaging facility are estimated for heavy clinical work loads. For simple source approximations and estimated study activities and times, exposure rates are computed that are larger than those anticipated in traditional nuclear medical imaging facilities. Measurements of exposure rates indicate that such an approach will result in conservative estimates of exposure by a factor of 1.2-6.3. Exposure rates due to gas lines may be kept at reasonable levels by careful planning of the routing of the line and by using high flow rates and small bore tubing. If reasonable care is taken to maintain the system so that only a limited number of failures occur, the doses due to pneumatic transport system operation are also small. The nonextremity doses to personnel and other individuals not involved in radiotracer preparation are estimated to be highest due to exposure to the patient sources. Shielding for 511 keV photons may help to minimize exposure. Several practical suggestions are given for further reducing exposure to personnel.

Equipment Design↗