In order to obtain more information on the relation between thermally stimulated exoelectron emission (TSEE), thennoluminescence (TL), and the impurity content in different TL grade, analytical and technical grade samples of LiF and BeO, a number of experiments have been carried out, in particular (a) semi-quantitative spectroanalysis and mass spectrography, (b) an investigation of the TL sensitivities and glow curves for different dose levels and LET of the radiation, arid (c) studies on ?'SEE sensitivity and peak locations (including their dependence on LET and heating rate).Sintered B e 0 samples exhibit the highest TSEE sensitivity, in particular after their work function has been reduced by the partial diffusion of inert metals into the surface. The results are discussed on the basis of the existing information on TSEE and TL in LiF and BeO.
A study was made of the stability over a period of a year of radiophotoluminescence in metaphosphate glass microdosimeters in dark storage. The exposures ranged from lOOr to 100 kr. Three types of glass were studied-one, a "high" atomic number glass, and two of lower atomic number.At moderate exposures the fluorescence output of the high Z-glass decreased monotonically with time, while that of the low 2-types increased slightly at first then decreased, but remained within 10 per cent of the 24 hr readings throughout the period. At high exposures, where discoloration occurred, the decrease in ultraviolet opacity perturbs this pattern.Direct sunlight was found to produce a significant decrease in fluorescence.
An electron beam introduced into an infinite medium is scattered and absorbed as the electrons slow down. The ionization produced by the beam in a plane air cavity perpendicular to the initial beam direction was used to measure the spatial rate of energy dissipation at various distances from the plane of incidence. At beam energies of 57, 80, 104, and 126.5 kev, agreement within a few percent on an absolute basis with the Spencer theory of electron penetration was found if the value of W, the average energy to make an ion pair, is taken for air to be 34 electron volts per ion pair. 0.5 ^ 0.4 e "X Q2 y / / / / f-\ W
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