By Robert Crispin Evans
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Certain features should be noted here. The actual size of the focal spot is determined by the ratio of the potential difference between the cylinder and filament to the potential difference between the filament and target. The cylinder potential is proportional to the X-rays and their Applications 36 FILAMENT \ LT. T. TARGET \ + FIG. 18. lllustrating the method of controlling the size of the focal spot using a Wehnelt cylinder tube current and the resistance between the tapping and the filament.
Such a method is useful for the filament current and the high tension supply. Another method of stabilisation is the use of electronic stabilising circuits and this method is useful for the prevention of fluctuations in the tube current. 18. 33 microfocus X-ray generator. c. high tension supply. Safety circuits are provided and stabilisation of the filament current is available to supplement the self-stabilisation provided by the operation of the tube as a saturated diode. 3. REFERENCES 1. See for example: (a) YARWOOD, Electricity, Magnetism and Atomic Physics.
This is due to ionisation by collision which, if the potential difference is large enough, is cumulative and leads to a Townsend avalanche. 3 The number of ions produced per primary ion, called the gas amplification factor, may be as high as 104 _10 5 and since, within certain limits of applied potential difference, it is constant for a given potential difference, the total number of ions is proportional to the number of primary ions formed. This state of affairs is best achieved in a cylindrical chamber with the electrodes consisting of a cylinder and a fine wire on the axis of the cylinder.