PHOTOGRAPHIC

DOSIMETRY• Haziqah• Nida

• Zubaidah• Nina• Asma• Diana

PRINCIPLES OF PHOTOGRAPHIC DOSIMETRY Photographic film is made up of a thin polyester

sheet coated on one or both sides with a silver bromide (Ag+Br-) emulsion.

When exposed to ionising radiation, an electron may be released by the bromide atom and be captured by the silver atom.

The neutral silver atom may then fix itself to the polyester sheet, sometimes dragging nearby silver atoms with it.

When developed, the silver bromide emulsion is removed but the silver atoms remain on the sheet, giving a dark appearance. The amount of darkness corresponds to the dose received by the film.

CHARACTERISTIC CURVE

CHARACTERISTIC CURVE