Rimbert J N, Kellershohn C, Dumas F, Hubert C
Phys Med Biol. 1981 Mar;26(2):221-30. doi: 10.1088/0031-9155/26/2/001.
TDPAC measurements of the 356-81 keV gamma-ray cascade resulting from electron capture decay of 133Ba have been performed at room temperature on BaCl2 (aqueous solution and polycrystalline powder), and on samples where the 133Ba nucleus is bound to bone powder, and also to synthesised hydroxylapatite, all after absorption in vitro. As expected, the angular correlation is not perturbed in the solution. However, in the polycrystalline chloride the time dependence of the anisotropy of the cascade of 133Cs nuclide indicates that the decaying nucleus undergoes electric interactions due to different electric field gradients acting at the site of the nucleus. In 133Ba-bone powder the results show a static quadrupolar interaction differing with the absorption contact time during sample preparation, indicating that depth of 133Ba ion fixation in the bone crystal is dependent on this contact time. These results seem to be confirmed by the TDPAC measurements performed on 133Ba-hydroxylapatite samples where the contact times for absorption of active-ion 133Ba and hydroxylapatite in suspension were very different.
在室温下，对133Ba电子俘获衰变产生的356 - 81 keVγ射线级联进行了扰动角关联γ射线角关联（TDPAC）测量，测量对象包括BaCl2（水溶液和多晶粉末），以及133Ba原子核与骨粉结合的样品，还有与合成羟基磷灰石结合的样品，所有这些都是在体外吸收后进行测量的。正如预期的那样，溶液中的角关联未受扰动。然而，在多晶氯化物中，133Cs核素级联的各向异性的时间依赖性表明，衰变核由于作用于原子核位置的不同电场梯度而经历电相互作用。在133Ba - 骨粉中，结果显示静态四极相互作用随样品制备过程中的吸收接触时间而不同，这表明133Ba离子在骨晶体中的固定深度取决于此接触时间。对133Ba - 羟基磷灰石样品进行的TDPAC测量似乎证实了这些结果，在该样品中，活性离子133Ba与悬浮液中的羟基磷灰石的吸收接触时间差异很大。
