In order to clarify the reactivity of normal chain diols, the hydrogen-isotope exchange reaction (T-for-H exchange reaction) between solid poly (vinyl alcohol) labeled with tritium and each normal chain diol dissolved in 1, 4-dioxane has been observed in the range of 30 to 70 °C (or 90 °C) . The observed data was analyzed with the A″-McKay plot method, and the following three matters are consequently found. (1) The greater the number of methylene groups in a diol is, the smaller is the reactivity of the diol. (2) A significant difference in the reactivity is found between diols having even number of methylene groups and those having odd number of ones, and the reactivity of the former is larger than that of the latter. (3) As to the ratio of the decrease of the reactivity of the diols having increasing number of methylene groups, the ratio of diols having even number of methylene groups is greater than the ratio of diols having odd number of ones.
Results of a survey of222Rn concentration using direct measurement in 834 Cairo houses are reported. Although the study was not random with respect to population or land area, it was useful in identifying areas at risk and locating several houses having elevated indoor222Rn air concentrations. Approximately 22% of the houses tested exceeded 37 Bq/m3, with 2.4% exceeding 70 Bq/m3. Several Cairo regions had larger fractions of houses exceeding 49 Bq/m3, such as Madinat Al-Muquattam (44%), Manshiyyat Nasir (31 %), Al-Abbasiyyah (29%) and Hadiak Al-Qubbah (17%), Elevated222Rn concentrations were measured for a variety of house types having different construction materials. The effect of water was identified as a potentially significant source of222Rn in Madinat Al-Muquattam homes. This survey is the first by this method in Egypt (a hot region) . The indoor concentration of222Rn were measured in homes, in different locations within the flat, also the concentration of radon has been shown to decrease with the increase of the distance of room investigated from ground level with different heights in a tall building during the winter and summer seasons. Indoor radon concentration ranged from 6.32 Bq/m3to 97.68 Bq/m3and averaged value with standard deviation was 21.77±7.85 Bq/m3. The concentrations of radon in the unoccupied flats were observed to be considerably higher than those occupied one.