PubMed · 4445808
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R S Wriston. 1974. A collimator for soft x rays.. https://doi.org/10.1063/1.1686563
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The solar radiation spectrum and the properties of its components are studied in the present paper. The history of the sun rays before reaching earth surface is analysed. A simplified analysis of the interaction mechanisms of these components with molecules, the energy absorption capabilities of the latter and the expected biological consequences are considered. Special emphasis are given to the properties of ultra-violet and infra-red radiations and their production considered.
The effect of self irradiation on yeast cells has been investigated by counting the young gemmae formation in 104 self irradiated samples, as compared with an equal set of control samples. The results show that the rate of gemmae formation is higher in self irradiated samples; the statistical significance of the results is discussed.
The overall performance of a Compton spectrometer and, in particular, its energy resolution are investigated both experimentally and theoretically for different scattering materials. Using low-Z (less than or equal to 8) scatterers of moderate sizes (scatterer diameter d less than or equal to 5 mm), there are negligible disturbances due to coherent and/or multiple scattering at 90 degrees scattering angle and photon energies above 20 keV. Two factors contribute to decreasing the energy resolution compared with that in direct measurements: (i) the velocity distribution of the electrons in the scatterer and (ii) the scattering geometry. Of these, (i) is dominant for photon energies less than or equal to 100 keV. The optimal scattering material is a metal of as low Z as possible, i.e. beryllium. However, polyethylene and lucite are normally sufficiently good scatterers. The scattering geometry may become the dominating factor decreasing energy resolution at high photon energies hv greater than or equal to 150 keV.