. Dental radiology . emical effect upon a prepared pastil exposed chemical pastil changes color during its exposure to therays and the shade of color is compared with a scale devisedby Sabouraud. The intensity of the rays is measured in units calledHolznechts units, or as they are generally spoken of as example, the dose necessary to produce the slightesterythema on the face of an adult is equivalent to three of the 135 Holznecht units, or 3H. Now the greatest dose necessary forthe taking of a radiograph is but a small fraction of a singleH unit. From this you will s
. Dental radiology . emical effect upon a prepared pastil exposed chemical pastil changes color during its exposure to therays and the shade of color is compared with a scale devisedby Sabouraud. The intensity of the rays is measured in units calledHolznechts units, or as they are generally spoken of as example, the dose necessary to produce the slightesterythema on the face of an adult is equivalent to three of the 135 Holznecht units, or 3H. Now the greatest dose necessary forthe taking of a radiograph is but a small fraction of a singleH unit. From this you will see the enormous margin of safetyunder which we are working in the exposure of our to-day an erythema is produced on a patient, from the effectof the exposure employed for the taking of a radiograph, it isdue entirely to the faulty technique of the operator. Thereis no excuse for such a thing happening, even where there isa marked idiosyncrasy toward X Ray effects on the part ofthe patient. 136 RADIOGRAPHS. Figure 26—(see page 177) 155
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