USGS · 70215314
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C.W. Tittle, Henry Faul. 1950-12-01. The thermal neutron absorption cross section of silicon. https://doi.org/10.1103/physrev.80.908
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The magnetic susceptibility of the orthorhombic form of titanium dioxide has been measured from 5 to 300°K. After deducting the temperature-dependent component, which is probably due to defects or impurities, and the free-ion diamagnetic component, the Van Vleck paramagnetism was estimated to be 33× 10 − 6 emu/mole. Comparison is made between this value and the Van Vleck paramagnetism of strontium titanate and the two tetragonal forms of titanium dioxide: rutile and anatase.
Careful measurements have been made of the magnetic susceptibility of the rutile and anatase crystalline forms of titanium dioxide. The magnetic susceptibility of a single crystal of high-purity rutile was found to be (0.067±0.0015)× 10 − 6 emu per gram, and was temperature-independent from 55° to 372°K. Difficulty was encountered in obtaining a good value of the magnetic susceptibility of anatase because of impurities. However, a value of 0.02× 10 − 6 emu per gram was obtained as a maximum value for anatase powder. A discussion is given for the different values obtained for anatase and rutile.
The half-life of Th 232 has been calculated by determining an absolute gamma-disintegration rate for Tl 208 in equilibrium with Th 232 for three old thorium nitrate salts and one natural thorite sample. The branching ratio, α/ ( α + β ) , for Bi 212 , a necessary parameter in the calculation, was also measured. The half-life of Th 232 was found to be 1.42× 10 10 years within an estimated error of 5%, which is essentially in agreement with the presently accepted value. The branching ratio, α/ ( α + β ) , of Bi 212 was found to be 0.362±0.006, about 7.4% higher than the currently accepted value.