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The effects of core rearrangements on the dose rate, y-contamination and the neutron spectrum were studied by physical measurements and biological experiments. The neutron spectrum was characterized by the ratio of effective neutron fluence rates measured with In and S. This fluence ratio, the neutron fluence and dose rate normalized to unit MW reactor power, as well as y-contamination are characteristic of the shielding. Physical measurements are consistent with the percentage survival patterns of CFLP white mice.

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