film xray.pptx
TRANSCRIPT
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Pencucian FilmAisyah Rahmadini
12-258
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Jenis Film Berdasarkan sensitivitas
Blue sensitiveGreen sensitive
Berdasarkan penggunaan screenScreen filmNon-screen film
Berdasarkan kecepatan filmKecepata
nKristal Detail Radiasi
Tinggi Kasar & besar
Rendah Sedikit
Sedang Sedang Sedang SedangRendah Kecil &
halusTinggi Banyak
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Lapisan FilmSupercoatEmulsionSubstratumFilm base
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EmulsionKetebalan : 5-25 µmBahan : Butiran perak halida (AgBr) + perak
iodida 2-4 % = perak iodobromida → kristal
AgNO3 + KBr AgBr + KNO3
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Silver Iodo Bromide CrystalsKristal yang sempurna hampir tidak memiliki sensitivitas fotografi. Ion I- membuat defek pada kristal.Allylthiourea akan bereaksi dengan perak halida dan membentuk perak sulfit.
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Proses Pembentukan Gambar (Gurney Mott ‐Theory)
Br - + light photon → Br + e-
Ag+ + e- → Ag
6-10 Ag → latent image → developable
Br atoms leaves the crystal and diffuses into gelatin
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Proses Pengolahan Film1) Developing2) Rinsing3) Fixing4) Washing5) Drying
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Developing Bahan pelarut (solvent) : air Bahan developer (developing agent) :
phenidone & hydroquinone Bahan pemercepat (accelerator) : NaOH dan
Na2CO3
Bahan penahan (restrainer) : KBr Bahan penangkal (preservative) : Na2SO3
Bahan pengeras (hardening agent) : C5H8O2
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Proses Kimiawi
2AgBr + H2Q + Na2SO3 → 2Ag + HBr + HQSO3Na + NaBr
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RinsingFilm dibilas dengan air selama 10 menit
untuk menghilangkan sisa-sisa larutan developer.
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FixingFunctions :1. To stop further development2. To clear the image3. To fix the image4. To complete the process of hardening of
the film emulsion
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Larutan fixer :Bahan pelarut (solvent) : airBahan penetap (fixing agent) : Na2S2O3
Bahan pemercepat (accelerator) : CH3COOHBahan penangkal (preservative) : Na2SO3
Bahan pengeras (hardening) : Al2(SO4)3
Bahan penyangga (buffer) : CH3COONa
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Reaksi Kimiawi
Na2S2O3 + AgBr → Na2Ag(S2O3)2 + NaBr (larut dalam air)
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Washing and DryingFilm dicuci dengan air mengalir untuk
menghilangkan sisa-sisa larutan fixer dan dikeringkan
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