FIGURE 2-9. The sensitizing action produced by a certain kind of sensitizing dye is influenced by the type of emulsion to which the dye is to be added, in particular, the halogen composition, crystal habit and crystal system of the silver halide. can be used. The sensitizing dyes are added to an emulsion in a manner well known in the art. A silver halide photographic emulsion as claimed in claim 1 wherein R, 11. They swing open on a hinge mechanism. No. It is interesting to repeat this exercise for the silver halides, which have either the NaCl structure (AgF, AgCl, AgBr) or zincblende structure (AgI). Dyes having as substituents R1 and R2 only well known unsubstituted alkyl groups such as methyl, ethyl, etc., do not exert a supersensitizing action when used together with the sensitizing dye represented by general formula (II). Other objects of the invention will become apparent from the following description of the specification. This chapter discusses those factors that the radiographer/limited x-ray machine operator (LXMO) can control and measure, and offers general concepts for assessing radiographic quality. Direct exposure film provides a sharp image of thin body parts having high subject contrast. As is clear from Table 1, the combined use of the dye represented by general formula (I) and the dye represented by general formula (II) provides higher sensitivity (to both white light and yellow light) as compared with the case of using the sensitizing dye represented by the general formula (I) alone. No. Incorrect matching of the film and screen will result in a slower film/screen system speed, which means using a longer exposure technique. Direct exposure film was primarily employed to assess the extremities but has been widely replaced with faster high-detail film/screen combinations. In addition, it is clear from Table 3 that the red sensitivity obtained using dye I-E or I-G (corresponding to the dye represented by the general formula (I) wherein Ro is a hydrogen atom) together with dye (II-6) is greatly reduced as compared with that obtained using them independently. The film is processed, and each step of density is read and plotted on special graph paper. It is a product of milliampere multiplied by the exposure time expressed in seconds (s). However, faster films are not as sharp as slower films. Missed the LibreFest? 0.6 Î¼ or fine grains of less than ca. All cassettes have a backing material to absorb radiation that passes through the cassette. The radiographic density, also referred to as optical density (OD), is defined as the amount of blackening in a radiograph. Silver halides are ionic crystals consisting of a regular cubic lattice of Ag and halide ions together with a small proportion of defects, such as Ag ions that have been displaced from their regular lattice position to another “interstitial” position (the Ag ions are much smaller than the halide ions), and the corresponding vacancy in the lattice. Densities are read by a specialized light meter called a densitometer, and the results are measured in logarithms. A silver halide photographic emulsion as described in claim 1 wherein a silver halide comprising silver bromoiodide is used. Inappropriately matched film/screen combinations can significantly impair the radiographic quality. If gamma is a reference, it is best to determine exactly which of the “contrasts” is being referred to. The speed of one film can be expressed on a relative basis to another when one is made the standard of comparison. On a logarithmic scale, the same distance on the exposure scale, regardless of the absolute values, will always separate any two exposures whose ratio is constant. 2 shows spectral absorption curves of samples prepared by adding dyes to a silver bromoiodide emuslion (I:1.5 mol%) mainly comprising regular grains having a (1 1 1) face and applying to a film, wherein curve 1 is the spectral absorption curve obtained by adding 4 cc of sensitizing dye I-10 to the emulsion (per 100 g) as a solution of 5 Ã 10- 4 mol/liter, curve 2 is the spectral absorption curve obtained by adding 4 cc of sensitizing dye II-6 to the emulsion per (100 g) as a solution of 1 Ã 10- 3 mol/liter, and curve 3 is the spectral absorption curve obtained by adding 4 cc of sensitizing dye I-10 as a solution of 5 Ã 10- 4 and 4 cc of sensitizing dye II-6 as a solution of 1 Ã 10- 3 mol/liter to the emulsion (per 100 g). This is known as the law of reciprocity (Figure 2-3). Determination of average gradient.
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