[en] Two patients with femoral neck fractures, one displaced and one undisplaced, are presented. Preoperative intravital staining with tetracycline and Tc-MDP scintimetry both showed intact femoral head circulation while Tc-MDP-scintimetry 1 week after operation showed pronounced circulatory deficiency. SR⁸⁵-scintimetry performed at the same time was inconclusive. Segmental collapse was observed radiographically, 8 and 12 months postoperatively. The major vascular injury resulting in avascularity most probably occured during the procedure of osteosynthesis, and Tc-MDP-scintimetry was found suitable for early postoperative recognition of avascular necrosis in both fractures. (author)

[en] The administration of a single dose of isoprenaline to adult male rats stimulated ⁸⁵Sr uptake by their blood, liver and myocardium. Whereas the ⁸⁵Sr concentration in the blood and liver rose by only 36% and 42% respectively, the increase in the various compartments of the heart was 5 to 7 times this value. This finding is also documented by the increase in the ratio of the ⁸⁵Sr concentration in the heart and the blood. The increase observed in ⁸⁵Sr accumulation in the myocardium is comparable to repeatedly described changes accurring in radioactive calcium after the administration of isoprenaline. (author). 2 tabs., 9 refs

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No abstract available

[en] Radiostrontium ⁸⁵Sr sorption experiments were carried out at 4^oC and 20^oC using natural samples of the epiphytic foliose lichen Hypogymnia physodes. Thalli were incubated in water solutions containing 10^-5 to 10^-1 mol.l^-1 SrCl₂ for up to 24 h at the initial pH 5.5. Sorption equilibrium at 4^oC and 20^oC was observed within 1 hour and did not change within the next 24 hours. Sorption process can be described well by Freundlich adsorption isotherm in both linearized and non-linearized form, not by Langmuir adsorption isotherm. Inactivation of lichen biomass by formaldehyde or temperature pretreatment did not cause loss of biosorption activity. ⁸⁵Sr biosorption was strongly pH dependent increased from negligible values at pH 2 up to nearly 100% uptake at pH 5.5. Bivalent cations Me²⁺ act as competitors for ⁸⁵Sr biosorption with the competition effect increasing in the order Co < Mg < Ca < Cd < Ni < Ba < Zn < Cu for Me²⁺ concentration 0.01 mol·l^-1. A number of displacing agents have been tested for their ability to release extracellular bound ⁸⁵Sr²⁺ ions from Hypogymnia physodes. Displacing efficiency increases in the order: water <<< EDTA (acid) < NaHCO₃ < Na₂EDTA < oxalic acid < BaCl₂ < MgCl₂ < CaCl₂ < SrCl₂. Efficiency of strontium biosorption by different lichen taxa will reveal their role in fixation of radiostrontium contamination in biosphere. (author)

[en] Bone scanning was attempted in the five representative cases in various diseases such as primary bone tumor, inflammatory or traumatic changes, secondary metastatic bone tumor and changes in the hematopoietic system with ⁸⁵Sr which is available at this time. Each findings were correlated to the X-ray findings. Scan findings were more appreciable than the X-ray findings in elucidation of extent of bone pathology in cases of primary bone tumor and fracture cases. Especially, increased radioactivity was noted on the clinically suspected region which were not demonstrated on the plain X-rays.

No abstract available

[en] The authors propose a metabolic Strontium 85 therapy for painful multiple disseminated metastases with Tc-phosphonate uptake on diagnostic scintigraphy. 65 courses were administered to 59 patients. Results were encouraging with pain relief in more than 7 out of 10 cases. (Author)

[en] The results of NPL's seventh Environmental Radioactivity Intercomparison Exercise are reported. The level of metrological performance was similar to that observed in the previous exercise. The inclusion of a β/γ-emitting sample at the 1-5 Bq kg^-1 level revealed problems with the identification and measurement of ⁸⁵Sr. An increasing number of laboratories are making corrections for cascade summing. Although there was some evidence to suggest underestimation of Type B uncertainties, nearly all quoted overall uncertainties exceeded the corresponding NPL values. (author)

[en] Differences in the Cs-134 and Sr-85 uptake by three barley and two maize varieties were investigated in a water culture experiment. In barley, the maximum differences were about 30% for cesium and 50% for strontium. The differences between the maize varieties were negligible. The maximum difference between the varieties of the two species of crops was approximately 30% for cesium and 1 70% for strontium with higher radionuclide uptake by maize. All barley varieties accumulated cesium nearly 3.5 times more effectively than strontium, whereas for the maize varieties, cesium was accumulated about 2 times more effectively. There is a large difference in the radionuclide distribution within the plants: the amount of radiocesium in the green part of plants of both species was approximately 30% of the total, while for radiostrontium it was about 80%. As a result, approximately the same amount of the radionuclides were present in the green part of plants, despite the large difference in the uptake of the radionuclides by the whole plants. It is concluded that crop selection as a provision to reduce radionuclide contamination of the food chain should only be applied taking into account the different radionuclide distributions within the plants