In honour of Prof. Dr. J. STUKE'S Goth birthday Lifetime and Doppler-broadening measurements in positron annihilation are used to investigate defects in silicon crystals irradiated with electrons of 1 MeV energy. The lifetime in undoped defect-free Si is found to be (218 8) ps. Isochronal annealing studies in the temperature range 12 K < T, < 600 K show that in undoped Si a t low temperature positrons annihilate a t neutral monovacancies and double vacancies with lifetimes of (268 & 10) and (318 & 15) ps, respectively.In boron-doped crystals before and after irradiation no special defect reveals in the spectra up to 400 K.
A double-blind, randomized, controlled trial in the treatment of primary chronic fissure-in-ano by digital stretching of the anal canal or by a modified lateral subcutaneous sphincterotomy is reported. Whereas there was no difference in the postoperative course of both groups, by checking 65 of 66 patients 6 months postoperatively, we found significantly more lacks of continence after stretching. There was no difference regarding recurrence rate. Pressure monitoring of the anal canal showed significantly higher values at rest in both groups before operation. No correlation between results of monitoring anal pressure and defects of anal continence has been seen. These results point out that in treatment of primary chronic fissure-in-ano the lateral subcutaneous sphincterotomy is superior to anal dilatation regarding postoperative defects of anal continence. The recurrence rate in the present study does not force to prefer one of these two methods. Manometric investigations show that the resting pressure in anal canal seems to be elevated in primary chronic fissure-in-ano.
Nuclear Spectroscopic Investigations in the Decay of 1 ~ s mCd The energy levels in 11Sin at 934, 1 133, 1291, and 1419 keV weakly populated by ,6--decay from 11SmCd have been studied by angular correlation measurements using NaJ(T1)-detectors. The previously measured angular correlations of the (485-934) keV cascade--which is practically isotropic--and the (158-1 133)keV cascade were remeasured with higher accuracy. A 286 keV transition between the 1419 and the 1 133 keV energy levels was observed and the highly anisotropic angular correlation of the (286-1 133) keV cascade was also measured.
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