Equation for the change in optical density of film dosimeters

Equation for the change in optical density of film dosimeters. 

There are several dosimeter systems being used for determining fhe absorbed dose. The simplest ones are thin-film dosimeters, which are suitable for use in routine practice. 

Type Film Thickness, pm Analysis Wavelength, nm Dose Range, kGy 

Each type of dosimeter requires a specific procedure to ensure accurate and reproducible results, such as postirradiation heat treatment. Others need to be stabilized for a certain time (up to 24 h with some) before readings of absorbance are taken. The absorbance reading can be done by conventional spectrophotometry or other, more involved methods. 

Other commercially radiochromic films are poly(methyl methacrylate) (PMMA), cellulose triacetate (CTA),i polyamide (nylon) films, poly(vinyl butyrate) with pararosaniline and p-nitrobenzoic acid, and alanine films. The CTA films are undyed PMMA films are available undyed and dyed (red and amber).  

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