[en] In this article the method of the measurement of the terrestrial radioactivity by the transferable gamma-spectrometers with Na(TI) 76 x 76 mm with the scintillation detectors and the air gamma-spectrometry on the area of the Czech Republic is described. The radiometric map of the Czech Republic 1:50000, brought out in 1995, expressed in dose rate input of gamma-radiation, is based on regional (1957-1959) and detail (1960-1971) air measurement of the summary gamma-activity, of the air gamma-spectrometry (from 1976) and it was amplified with the results of the terrestrial and laboratory radiometric measurements. The method of feed back calibration was realized in 1994 with the means expression of the data in dose rate and equalization of data of the map. The map of the iso-lines with the step 10 nGy.h^-1 was weaved by computer processing with the crining method. The regional terrestrial radiation in the Czech Republic, which is formed igneous, sedimentary and metamorphic minerals is in the range 15-200 (6-245) nGy.h^-1 with the average value (65.6+-19.0) nGy.h^-1. The radiometric map of the Czech Republic 1:500000 was verified in 1995-1996 by comparison with the terrestrial gamma-spectrometric measurement. The middle difference of the comparing sets 2.1 nGy.h^-1 indicate good regional equalization of the data while middle difference +-13.8 nGy.h^-1 illustrate expected difference for the individual locality. The correlation coefficient of data of the comparing sets (N=81) is 0.942. The radiometric maps of the Saxon and of the Czech Republic in the border zone with the length about 250 km were compared. The middle difference (1.3+-13.6) nGy.h^-1 nGy.h^-1 indicate good unity of the data. The radiometric maps of the Poland and of the Czech Republic in the border zone with the length about 300 km were compared in 1977. The middle difference (12.1+-17.9) nGy.h^-1 with higher values in the Czech Republic indicate the disunity of presentation of the radiometric data. The analysis of reasons of difference of the radiometric data are given

[en] The proceedings of the workshop contain 16 contributions, out of which 3 have been input to INIS. (P.A.)

[en] In the accordance with the literature the occurrence of the heart accidents in the group of patients with positive finding of the myocardium perfusion scintigraphy was essentially highest than in the group with negative finding

No abstract available

No abstract available

[en] The Proceedings contain 13 contributions dealing with the underground disposal of high level radioactive wastes and spent fuel, with emphasis on the feasibility of a future disposal within the Czech Republic. Discussed are the technological, environmental, legislative, and public acceptance aspects of this issue. The geology is described of the Melechov Massif, which is a prospective geologic disposal site in the Czech Republic. (P.A.)

[en] The purpose and goals of underground laboratories are highlighted, and an overview of underground laboratories worldwide is presented. In the Czech Republic, an underground laboratory project has been an integral part of the deep disposal programme since 1996. The use of an abandoned mine is preferred to the greenfield option. The only feasible site is the Pribram mine no. 16, which is currently used for the construction of a cavern type gas reservoir. A feasibility study is being developed for this option. Parallel discussions concerning the participation of the Czech Republic in foreign projects are being held. The study of natural analogs is also outlined, and a survey of the status worldwide is presented. In the Czech Republic, two projects associated with the study of natural analogs exist: the one is aimed at the degradation mechanisms and degradation rate of natural glasses (obsidian, tectites, Libyan glass), the other is concerned with the behavior of uranium in bentonite and is being addressed in cooperation with GRS Braunschweig. (P.A.)

[en] Chlorinated organic substances such as polychlorinated biphenyls can be dechlorinated with advantage by a procedure during which oxygen is removed from their alkalinized isopropanol solution (e.g., by nitrogen purging) and the latter is exposed to electrons accelerated to 1-5 MeV (typically 4 MeV) at dose rates of 10^-2 to 10² kGy/s (typically 0.1-10 kGy/s), total dose 1-100 kGy. A flow-through apparatus has been designed for this procedure, consisting of an accelerator, an irradiation circuit, and a separation circuit. The irradiation circuit comprises a tank for the chlorinated substances, a pump, an irradiation cell, and a filtering device. The separation circuit encompasses a tank for the irradiated substrate, a distillation facility where the solvent and volatiles from the dechlorination reaction are removed, and a separation unit where the final dechlorination product is separated. A relatively high dechlorination degree can be achieved even at high dose rates and doses as compared with gamma irradiation. (P.A.)

No abstract available

No abstract available