By National Council on Radiation Protection
1 SOFTCOVER publication
Read Online or Download Krypton - 85 in the Atmosphere: Accumulation, Biological Significance, and Control Technology (Ncrp Reports Ser. : 44) PDF
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Additional resources for Krypton - 85 in the Atmosphere: Accumulation, Biological Significance, and Control Technology (Ncrp Reports Ser. : 44)
These include a separation of the legs of the phantom, a region containing testes, and a rounded region for the cranium or top of the head. The use of an ellipsoidal shape for the head is due to the fact that the sliull contains about 13 percent of the red bone marrow of the adult, and thus the additional soft tissue present in the phantom, as described in MIRD Pamphlet No. 5, might somewhat shield this portion of the active marrow. Details of the phantom are given in Appendix B. Actually, one is concerned with a person on the surface of the ground, and thus a ground effect must be considered.
I t has been shown that fuel reprocessing plants will be the main source of this nuclide. Minor amounts will issue from the reactors of the world, but i t appears that this will be far less than 1 percent of the total. Thus, as an interim policy which should certainly be suitable for the next ten years, the releases from reactors can be given lower priority and attention directed at the fuel reprocessing plants. Research and development programs of practical systems for the removal of 85Krare making progress, and prudence would seem to dictate that the fuel reprocessing plants be equipped with 85Kr removal systems as soon as the technology is practicable.
7 years. Because of the characterietic inertness of the noble gases, this radionuclide tends to accumulate in the atmosphere with the concentration at any given point being determined by the rate at which it is introduced to the atmosphere, by meteorological diffusion, and by radiological decay. Neither the oceans nor the land surfaces act as significant sinks. Naturally-occurring 85Kr due to spontaneous fission of uranium and cosmic ray-induced atmospheric reactions occurs only in insignificant traces, and has been overwhelmed in recent years by production of this nuclide in weapons testing, reactor operation, and fuel reprocessing.