[en] A neutron surface probe has been developed for continuous and discontinuous determination of moisture in building materials. Technical parameters are given

[en] Exact observance of the water to cement ratio results in a constant quality of concrete on the one hand and in saving of cement on the other. To this end a module has been developed containing a neutron moisture gage and a water feeder. So, the moisture of the additives can be measured continuously and the quantity of water required can be added automatically. Saving of cement of more than 10 kg per m³ of wet concrete is possible. The installation of the module is only useful in concrete plants with a certain standard of automation

[en] The purpose of this paper is to develop and document a position on Relative Humidity (RH) requirements in the WSCF Laboratories. A current survey of equipment vendors for Organic, Inorganic and Radiochemical laboratories indicate that 25% - 80% relative humidity may meet the environmental requirements for safe operation and protection of all the laboratory equipment

[en] Checking the quality of live steam is an essential prerequisite for a careful mode of operation of a saturated steam turbine. For this purpose a steam moisture measurement system has been developed and introduced into the nuclear industry. In this article, the principle of measurement, parameters of the steam moisture probe, electronic data processing, operating instructions, and economical advantages are briefly discussed

[en] The aim of present research was to measure and analyze the dynamic changes of internal pressure in shrinking vs. non-shrinking materials during convective drying for the use as a possible process control method. Drying experiments were carried out on wet and fired clay at 50°C and 60°C. In addition, the shrinkage curve was investigated. Experimental measurements show the existence of 4 stages of the process. The comparison of the results for wet and fired clay shows differences in pressure trends. During drying the internal pressure changes from underpressure to overpressure at the level of 3÷5kPa, what correlates well with transition from the first to the second drying period. (Author)

[en] One of the options possible to reduce the CO₂ emissions is the CO₂ capture and sequestration in the coal layer with simultaneous methane production. This work presents the experimental isotherms of the adsorption on dry and humid coal at two temperatures (45 C and 70 C). The influence of the humidity is very important: at 45 C the CO₂ adsorption capacities are reduced of more than 40% and more tan 70% for the CH₄. (A.L.B.)

[en] Electrostatic collection technique is widely used in various radon monitors. The mechanism of this kind of radon monitor is that the positive Po particles, produced by decay of radon, can be collected on the surface of detector in electric field. Collection efficiency, therefore, could be affected by air humidity. Calibration under different humidity conditions or test of humidity response is necessary consequently. In this study, a humidity control technique based on Nafion membrane tube (NMT) is developed. Under a consistent flowrate with a certain stable level of radon concentration and humidity of main-path inlet, the humidity of outlet sample gas from the main-path can be adjusted and stably controlled at a certain level by changing side-path's flowrates of NMT. By adjusting main and side-path flowrate, RH of outlet gas of the main-path can be controlled from 5.3 to 80.0%. Theoretical study were also performed. Based on this, humidity influence calibration of an electrostatic radon monitor was performed, and a relationship between the sensitivity of the radon monitor and relative humidity was obtained. (authors)

[en] Complete text of publication follows. Riso B3 dosimeters were laminated by standard office lamination technique in order to protect them against environmental humidity influence. The properties of this modified dosimeter were determined and compared with the properties of the un-modified thin-film dosimeter. Irradiations were carried out at a 10 MeV electron accelerator and at a cobalt-60 gamma cell. Optimum post irradiation heating conditions were determined. It was possible to irradiate the dosimeter immersed in water, but the lamination did not provide an effective humidity barrier, and some influence of different humidities during irradiation on the response of the laminated dosimeter was found. The response of the laminated dosimeter was found to be as stable in time after irradiation as the un-modified dosimeter

[en] The safe and accurate delivery of the prescribed absorbed dose is the central function of the dose monitoring and beam stabilization system in a medical linear accelerator. The absorbed dose delivered to the patient during radiotherapy is often monitored by a transmission ionization chamber. Therefore it is of utmost importance that the chamber behaves correctly. We have noticed that the sensitivity of an unsealed chamber in a Philips SL linear accelerator changes significantly, especially during and after the summer season. The reason for this is probably a corrosion effect of the conductive plates in the chamber due to the increased relative humidity during hot periods. We have found that the responses of the different ion chamber plates change with variations in air humidity and that they do not return to their original values when the air humidity is returned to ambient conditions. (author)

[en] Some preliminary results of the effects of moisture content on volume emanation rates and emanation coefficients are presented for core and crushed samples of cemented tailings. The volume emanation rates increased with increasing moisture content, with saturated core samples emanating about 3 times as much as dry material. There was a similar increase in coefficient for the crushed cemented tailings