Optimal conditions are developed for two methods of simultaneous recording of 45Ca and 32P-radiation in the bone and other tissues. Both methods are compared from the standpoint of their efficiency. The calculation method for the 32P hard beta-radiation in the presence of 45Ca in one tissue specimen by the liquid scintillation counter is 5-10 times as efficient as that by the gas-discharge counter with the filter. The method for recording the low-energy 45Ca beta-radiation in the combination with 32P in one tissue specimen by the end-window gas-discharge counter and filter is more efficient to some extent that the calculation in the liquid scintillation counter.
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