Production of Monochromatic X-Radiation for Microradiography by Excitation of Fluorescent Characteristic Radiation

Abstract

ENERGY IN COPPER INTRODUCED BY COLD WORK 881 error in E to be of the order of 10 percent. It can be seen from these curves that this is so and that in the first run the release of latent energy begins at a temperature of between 100° and 125°C and is practically finished at a temperature of 250°C. As expected, the spread of the points becomes larger as the temperature increases. E, which is obtained as a simple average of the values of H(T), above 250°C, is given in Table 3 together with the value W. The last column shows the values obtained for E/W.A comparison between Tables 1 and 3 shows that our results, contrary to those of Sato, fail to show any saturation in this range of W so that the ratios of E/W are, as explained before, equal to e/w. On the other hand, the actual values of E/W are much closer to those of Sato than those of Taylor and his co-workers.It can be seen that the spread in the values of E/W obtained in the present investigation is of the order of magnitude of the variations to be expected on the basis of the errors involved in the annealing experiment. These errors, consequently, represent one of the factors limiting the accuracy of the determination of E/W.

The response of thermoluminescent dosimetric lithium borates equivalent to air, water and soft tissue and of LiF TLD-100 to low energy x-rays

“…Monochromatic jluorescent X-ray beams were obtained from pure metal secondary targets made of silver, samarium, t'antalum and lead respectively (Rogers 1952) and placed in the primary x-ray beam from a 220 kv GE Maximar Unit. The K-emission weighted mean energies were 2 2 , 43, 61 and 74 kev respectively.…”

X-Ray Absorption and Emission

“…) and that of cobalt (1.79 A), were used to determine iron (Kabsorption edge, 1.74 A.). Rogers (110,111) has demonstrated that newly developed beryllium-window x-ray tubes provide, beams of such high intensityas to increase the attractiveness of the foregoing scheme for producing monochromatic x-ray-s. Splettstosser and Seemann (117,118) independentlyaccomplished the same result, as their published microradiographs show.…”

Bremsstrahlung-induced K fluorescence

“…K-fluorescent x rays excited in a secondary target by photons from the primary target of an x-ray tube have been used to obtain monoenergetic sources in the 1-to 100-keV energy range. ''^ Fluorescent sources, which have been used for microradiography of histologic sections 4 and for metallurgical microradiography,' have found widespread use in energy response measurements of radiation detectors*' 1 ' 1 and as a method of elemental analysis. 11 The radiation emitted by the secondary target consists not only of K-fluore3cent x rays but also includes the scattered bremsstrahlung contaminant.…”