Untersuchungen zum biologischen Verhalten von Radio Technetium, Radio Indium und Radio Gallium während der Lakation.

The biological behavior of 67Ga, 113In, 99Tc(m) in blood, mammary glands, femur (mother animals) and in the whole body (young animals) was tested with 105 suckling Wistar rats with an average of 8 neonatals each, in comparison with non suckling control animals. +Ga accumulated progressively to a considerable extent in the neonatals between 3 and 24 hr p.i. via mother's milk. The mammary glands of suckling animals contained 67Ga in four times higher concentrations. The intraossary 67Ga accumulation of suckling animals is low ('decorporation effect' of the lactation). The transfer of +In via mother's milk is minimal, although twice as much indium is concentrated in the mammary glands as in control animals. A statistically significant difference of the retention behavior of +In in the bone structure of suckling and non suckling animals does not exist. The retention curve of +Tc in neonatals has a biphasal form (rise up to 6 hr p.i., drop up to 18 hr, renewed rise). The Tc kinetics in the mammary glands show a parallel pattern. The differential kinetics of the radionuclides are discussed

Experience with ²⁰¹Thallium in detection of myocardial infarction.

Our preliminary experimental and clinical results with 201Tl myocardial scanning are presented. 48 patients with normal coronary vessels, acute transmural myocardial infarction, localized and diffuse coronary heart diseases and congestive myocardiopathy were investigated. Results of scans and the usual cardiological investigations were in good agreement thus justifying further use of 201Tl myocardial scintigraphy as an adjunctive method in cardiology

A new measurement of the intensities of the heavy primary cosmic-ray nuclei around 1 TeV per AMU

We describe a new measurement of the intensities of the heavy primary cosmic-ray nuclei O, Ne, Mg, Si, and Fe from 10 GeV amu 1 to energies beyond 1 TeV amu 1. The measurement was conducted in 1999 during a 1 day test flight of the Transition Radiation Array for Cosmic Energetic Radiation (TRACER), a new cosmic-ray telescope designed for long-duration balloon flights. TRACER uses an array of thin-walled single-wire proportional tubes to determine the particle Lorentz factor from measurements of specific ionization and transition radiation. The nuclear charge is obtained with plastic scintillators, and low-energy background is identified with an acrylic Cerenkov counter. The results of this observation are consistent with previous measurements in this energy region. The current statistical limitations should be greatly improved with the planned long-duration exposure of TRACER. Subject headings: balloons — cosmic rays — instrumentation: detectors — ISM: abundances 1