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[en] Long term ex situ conservation depends on seeds response to desiccation and storage temperatures. This was the objective of this work. Moisture content (MC) of fresh seeds was assessed in oven at 103 Celsius degrade weighting the samples at regular intervals till constant weight. Seed tolerance to desiccation and temperatures was evaluated with 5 germination experiments: fresh seeds (10-12%MC); 3-5% MC and 3-5% MC stored 3 months at 25, 5 y -20 Celsius degrade, in two treatments: control and scarification. Moisture content was 11% in both species. In P. nigra seed germination was higher than 80% in scarified seeds in all experiments. Germination in the control seeds decreased with desiccation and storage. The storage temperature did not affect germination. The Z. mistol germination of fresh endocarps was low (<35%) and increased with the reduction in MC. In summary, P. nigra and Z. mistol are tolerant to desiccation and storage temperatures tested and can therefore be considered as probably orthodox.
[en] In order to maintain as well as possible and optimize use of the radioactive waste storage capacity of El Carbil ENRESA and the Electric Sector put a series of actions into motion in 1994 to reduce and optimize radioactive waste processing. As a result of this strategy, a moist waste desiccation system has been developed with Spanish technology by ENSA. This system was installed in Trillo NPP in 2001 and has operated satisfactorily for the past year, having significantly reduced the volume of waste generated by evaporator concentrates. This article describes the objectives, design and implementation of the desiccation system installed in Trillo NPP. (Author)
[en] In the present job they report the results obtained of the analysis by neutronic activation of 30 chemical elements, in 35 representative samples of soils of 17 zones of the western region of Cuba , affected by an epidemic of epidemic neuropathy. (author)
[es]En el presente trabajo se reportan los resultados obtenidos del analisis por activacion neutronica de 30 elementos quimicos en 35 muestras de suelos representativos de 17 zonas de la region occidental de Cuba afectadas por una epidemia de neuropatia epidemica. (author)
[en] Experimental results of the radon detection with the equipment RAD7 are presented. The use of a solid state detector placed in a semi-spherical chamber with an electric field allows a high sensitivity of 0.4 cpm/P Ci/l. Radon detection is achieved by the spectroscopy of its decay products. In accordance with a table of errors for various ranges of counts and radon concentrations, reported by the manufacturer, an equation was obtained that allows establishing operation criteria of the equipment. For radon detection at ambient concentrations as low as 30 Bq m"-"3, is shown that short counts of 10 minutes are good enough to make decisions on radiation protection matter. In places where concentrations are close to 200 Bq m"-"3, counting intervals of the order of 0.5 hours will have an acceptable counting error of the order of 20%. The determination of radon in soil was, according to the expected, on the order of 10 kBq m"-"3, and was found that even with the recommended counting times of 5 minutes, there is a risk of increased humidity inside the detector above 20% Rh, with associated reduction of detection efficiency, if the desiccant is not used properly. The equipment was subjected to a radon exposure in air of 13, 373 Bq m"-"3 ± 3.7%, contained within a controlled chamber, with a variation in temperature of (19-21) degrees Celsius and in the relative humidity of (5-7) %, the good stability of the chamber allows to propose calibration processes of these equipment s by assessing the concentration by means of a Ge (Hp) detector. (Author)