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PubMed1975

Firearm residue detection by instrumental neutron activation analysis.

Work leading to an improved technique for firearm discharge residue detection by neutron activation is described. The troublesome and time-consuming postirradiation chemistry has been eliminated; also, sample size has been minimized to accommodate some 130 samples per irradiation capsule. To put the method in a proper perspective, previous work has been referenced and discussed.

Activation Analysis↗
PubMed1991

The timing of alkali metasomatism in paleosols.

We have measured the concentrations of rubidium and strontium and 87Sr/86Sr values of whole-rock samples from three paleosols of different ages. The oldest of the three weathering horizons, the 2,760 Ma Mt. Roe #1 paleosol in the Fortescue Group of Western Australia, experienced addition of Rb, and probably Sr, at 2,168 +/- 10 Ma. The intermediate paleosol, developed on the Hekpoort Basalt in South Africa, is estimated to have formed at 2,200 Ma, and yields a Rb-Sr isochron age of 1,925 +/- 32 Ma. The youngest of the three paleosols, developed on the Ongeluk basalt in Griqualand West, South Africa ca. 1,900 Ma, yielded a Rb-Sr age of 1,257 +/- 11 Ma. The Rb-Sr systematics of all three paleosols were reset during post-weathering metasomatism related to local or regional thermal disturbances. The Rb-Sr systematics of the paleosols were not subsequently disturbed. The near-complete removal of the alkali and alkaline earth elements from these paleosols during weathering made them particularly susceptible to resetting of their Rb-Sr systematics. Paleosols of this type are therefore sensitive indicators of the timing of thermal disturbances.

Alkalies↗
PubMed1975

[Radiological check-up examinations for the assessment of therapeutic response in malignant bone diseases].

Results of the improved treatment in radiation therapy of malignant bone lesions demand regular check-up examinations in order to assess the therapeutic response. For this purpose roentgenographic verifications are recommended before the beginning of treatment and after finishing radiation therapy and furthermore two or three months later. Follow-up by radionuclide scanning is suggested. An initially possible increase of a bone lesion in the course of radiotherapeutic treatment does not justify to stop radiation therapy.

Bone Neoplasms↗