Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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12.7μm sensitive silver halide<br />
blue-tinted base<br />
When x-rays, gamma rays, or light strike the grains <strong>of</strong> the sensitive silver<br />
halide in the emulsion, a change takes place in the physical structure <strong>of</strong> the<br />
grains. This change is <strong>of</strong> such a nature that it cannot be detected by ordinary<br />
physical methods (latent image) . However, when the exposed film is treated<br />
with a chemical solution (developer), a reaction takes place, causing<br />
formation <strong>of</strong> black, metallic silver. It is this silver, suspended in the gelatin on<br />
both sides <strong>of</strong> the base, that creates an image<br />
Charlie Chong/ Fion Zhang
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