Radionuclide Distribution in Pacific Salmon

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Abstract
Seventeen gamma-emitting radionuclides were measured in four different species of Pacific salmon. The concentration of the radionuclides 54Mn and 60Co decreased in the muscle tissue from northwestern Alaska through southern Alaska to the Oregon-Washington Coast (approximately 1.5 to 3 and 4.5 to 12, respectively) while the concentration of 137Cs decreased less pronouncedly (approximately 25%). The distribution pattern of other radionuclides was influenced by the Columbia River, Chinese nuclear testing, and other parameters. Concentrations of natural 226Ra in Alaskan salmon tissue were sufficiently high to permit native fish-eating populations to exceed their maximum permissible concentrations (percent MPC calculated for a 600 g per day intake using ICRP recommendations of 1/30 MPC for nonoccupationally exposed individuals). Other radionuclides measured were 22Na, 40K, 46Sc, 51Cr, 57Co, 59Fe, 65Zn, 88Y, 110mAg, 140Ba, 152Eu, 203Hg and 208Tl.

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