Thicknesses of the Deposits of Plutonium and Radium at Bone Surfaces in the Beagle

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Abstract
The thickness of the initial deposit of 239Pu at endosteal bone surface in a beagle dog was found to be ≤ 0.2 μm 90 days after injection of monomeric 239Pu. For 226Ra the thickness of the endosteal surface deposit was found to be ≤ 6.5 μm 5 hr after injection. The thicknesses were determined by measuring the energy loss of alpha-particles emitted from the bone surfaces. If 239Pu were deposited in uniform concentration to a depth of 0.2 μm, then the rate of escape of a-particle energy from the surface would be 98 % of that from a plane surface source of infinitesimal thickness. For 224Ra uniformly deposited to a depth of 5 μm, the energy escape would be 76–81 % of that from a surface source of infinitesimal thickness, depending on the assumption made about retention of daughter products.

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