By Shu
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Example text
These sources usually contain iridium-192, cobalt-60, and cesium-137. All these are gamma emitters, and dose rates on the surfaces of the sources are usually in excess of 50 Gy/min. More than 90% of accident situations with such sources include severe injuries of the hands or the buttocks, hips, and abdomen. The latter occur because the sources are often put in the pockets of clothing (see Chapters 15 and 17). Radiation sources with cobalt-60 are also used for sterilization of food products and medical equipment.
As a result, these effects require a specific threshold of dose and an elevation of dose increases the incidence rate and the severity of the effect (the severity grade of radiation sickness). The development of radiation sickness, therefore, is the final stage in the complex chain of events initiated by ionizing radiation and energy absorption in 7004_ch03_fm Page 26 Friday, February 2, 2001 8:29 PM Pathogenetic classification of radiation sickness in humans. 3 26 7004_ch03_fm Page 27 Friday, February 2, 2001 8:29 PM Radiation Sickness Classification 27 the tissues.
External and/or internal contamination (inhalation, ingestion, skin or wound contamination); b. Radiation spectrum and degree of homogeneity of dose distribution in time, space, and body surface; c. Number of people involved, significantly exposed and other injuries; d. Basic clinical manifestations to allow clinical prognostication; e. Type of therapeutic actions required, where these will be done, and who is qualified to do them; f. Other unfavorable factors of the accident. 3. Determine the information required for the following: a.
Radiation by Shu
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