Low dose gamma film dosimeter based on chitosan and starch bio-polymer with methyl orange dyes has been synthesized and characterized. The aim of this research was to synthesis radiochromic film dosimeter used biopolymer material such as chitosan and starch with methyl orange dyes as the color indicator and also to investigate the effect of gamma irradiation on film dosimeter response. The film dosimeter was prepared by mixing chitosan and starch at gelatinization temperature then added with methyl orange dyes. Biopolymer solution then casting on the flat glass to produce a thin film with uniform thickness, after that film dosimeter was irradiated at 1, 3, 5, and 9 kGy. To analyze the quantitative response of irradiation, the film dosimeter was characterized by UV-Visible. The result shows that the film dosimeter has changed its color as a response to the irradiation. The higher the dose of gamma irradiation, the higher the net absorbance of it. This research showed that bio-polymer based chitosan and starch is material that has the potential for low dose gamma dosimeter.

AbstrakTelah dilakukan penelitian tentang pengaruh penambahan montmorilonit terhadap interaksi fisik dan laju transmisi uap air komposit edible film xanthan gum-montmorillonit. Penelitian ini diawali dengan preparasi montmorillonit dilanjutkan dengan sintesis komposit edible film xanthan gum-montmorillonit kemudian karakterisasi untuk laju transmisi uap air komposit edible film xanthan gum-montmorillonit dengan WVTR, XRD untuk mengetahui jenis kristalin,mengetahui gugus fungsi komposit edible film xanthan gummontmorillonit dengan FTIR dan TEM untuk mengetahui interaksi antara xanthan gum dengan montmorillonityang terjadi di dalamkompositedible film xanthan gum-montmorillonit. Metode pencetakan yang digunakan adalah solvent casting. Hasil penelitian menunjukkan bahwa penambahan montmorillonit dapat menurunkan nilai laju transmisi uap air (WVTR) edible film ketika konsentrasi montmorillonit 2%, yaitu 15.3469 g/jam m 2 . Komposit edible film xanthan gum montmorillonit merupakan material amorf (non kristalin) yang mengalami interaksi fisik yang tidak signifikan akibat dari penambahan montmorillonit dalam jumlah kecil. Interaksi komposit edible film xanthan gum-montmorillonit yang terbentuk merupakan akibat dari proses eksfoliasi dan interkalasi.Kata kunc : Edible film, xanthan gum, montmorillonit, komposit. AbstractA study has been conducted on the effect of addition of montmorillonite to the chemical interaction and transmission rate of water vapor composite edible film xanthan gum-montmorillonite. This study begins with montmorillonite preparation followed by synthesis of edible film xanthan gum-montmorillonite and then characterization transmission rate of water vaporusing WVTR, XRD to know the crystalline type, knowing the composite edible film xanthan gum-montmorillonite functional groups with FTIR and TEM to determine the interaction between xanthan gum and montmorillonite occurring in the edible film xanthan gummontmorillonite. The printing method which is used as solvent casting. The results showed that the addition of montmorillonite could decrease the value of the water vapor transmission rate (WVTR) edible film when the montmorillonite concentration was 2%, that is15.3469 g / hr m 2 . The edible film xanthan gum-montmorillonite is an amorphous material (noncrystalline) experienced a significant insignificant physical interaction from the addition of montmorillonite in small amounts. Interaction of composite edible film xanthan gum-montmorillonite formed by exfoliation and intercalation.

Telah dilakukan penelitian tentang pengaruh penambahan montmorilonit terhadap interaksi fisik dan laju transmisi uap air komposit edible film xanthan gum-montmorillonit. Penelitian ini diawali dengan preparasi montmorillonit dilanjutkan dengan sintesis komposit edible film xanthan gum-montmorillonit kemudian karakterisasi untuk laju transmisi uap air komposit edible film xanthan gum-montmorillonit dengan WVTR, XRD untuk mengetahui jenis kristalin,mengetahui gugus fungsi komposit edible film xanthan gummontmorillonit dengan FTIR dan TEM untuk mengetahui interaksi antara xanthan gum dengan montmorillonityang terjadi di dalamkompositedible film xanthan gum-montmorillonit. Metode pencetakan yang digunakan adalah solvent casting. Hasil penelitian menunjukkan bahwa penambahan montmorillonit dapat menurunkan nilai laju transmisi uap air (WVTR) edible film ketika konsentrasi montmorillonit 2%, yaitu 15.3469 g/jam m 2. Komposit edible film xanthan gum montmorillonit merupakan material amorf (non kristalin) yang mengalami interaksi fisik yang tidak signifikan akibat dari penambahan montmorillonit dalam jumlah kecil. Interaksi komposit edible film xanthan gum-montmorillonit yang terbentuk merupakan akibat dari proses eksfoliasi dan interkalasi.