ABSTRACT
Nanodiamond thin films were deposited onto Si (100) substrates using Tequila as precursor by pulsed-liquid injection chemical vapour deposition at 850 degrees C. Some samples were exposed to beta particle irradiation in the dose range from 100 to 1600 Gy, and it was found that the thermoluminescence (TL) response is a linear function of dose. The glow curve displays two maxima centred at 170 and 350 degrees C, which does not shift when dose changes, indicating that first-order kinetics processes are involved. From the results, it is concluded that the new nanodiamond films are promising high-dose TL dosimeters.
Subject(s)
Diamond/chemistry , Diamond/radiation effects , Nanostructures/chemistry , Nanostructures/radiation effects , Thermoluminescent Dosimetry/methods , Dose-Response Relationship, Radiation , Mexico , Radiation DosageABSTRACT
We studied serum concentrations of magnesium post-operatively in 41 patients divided up into four distinct groups, depending on the degree of seriousness of the operation, the loss of body fluids and the duration of intravenous feeding. The results thus obtained showed us that in digestive disorders there is an initial fall in blood magnesium accentuated in operated patients submitted to continous gastric aspiration or an external biliary drain. In these same patients, there is a tendency to normalisation from the second day after the operation. Only patients with gastric or intestinal fistulas had a curve which fell to the seventh post-operative day reaching severe levels of hypomagnesemia.