Dark room ( g.majumdar)

DARK ROOM

1. - GEETASHREE MAJUMDAR - ASSISTANT PROFESSOR DEPARTMENT OF RADIOLOGY AND IMAGING TECHNOLOGY D A R K R O O M

2. What is D a r k r o o m ? D a r k room i s a r o o m f r o m w h i c h n o r m a l l i g h t i s e x c l u d e d . I t i s m a d e c o m p l e t e ly d a r k t o a l l o w t h e p r o c e s s i ng o f light s e n s i t i ve p h o t o g r a p h i c f i l m . D a r k r o o m i s a l s o c a l l e d a s p r o c e s s ing r o o m . I d e a l s i z e o f d a r k i s 1 s q u a r e f e e t f l o o r s p a c e .

3. L o c a t i o n o f Darkroom . C e n t r a l l y located . A w a y f r o m d a m p o r h o t a r e a . S e r v i c e s b y h a t c h e s f r o m t h e a d j a cent image r o o m . .

4. H a t c h e s o r p a s s b o x . • H a t c h e s a r e d e s i gned t o t r a n s f e r f i l m c a s s e t t e t o a n d f r o m t h e d a r k r o o m w i t h o u t r a d i a t i o n l i g h t e n t e r ing . • I t c o n s i s ts of m e t a l l i c s t r u c t u r e s w i t h a l e a d l i n i n g t o p r o v i d e x-ray s h i e l d i n g . • T h e y a r e typically w a l l m o u n t e d a n d i n c l u d e a u t o m a t ic i n t e r l o ck s t h e t c l o s e o n e d o o r w h e n a n o t h e r o p n e d . • I t i s a l s o u s e d f o r t h e temporary s t orage o f l o a d e d c a s s e t t e s .

5. S i z e M i n i m um f l i o r a r e a o f 2 s q m e t e r . C e i l i l n g h e i g h t of 2 . 5 t o 3 m t r . S i z e m a y b e r e d uced d e p e n ding upon t h e d e p a r t ment .

6. R a d i a t i o n p r o t e c t ion . E a l l a d j a c e nt to the r a d i o g r a phic r o o m s h ould be s h i e l d e d w i t h c o r r e ct t h i c k ness o f t h e l e a d a l l the way to the c e i l ing . 1 . 6 m m l e a d i s m o s tly u s e d .

7. F l o o r s . N o n - p o r o u s f l o o r i ng . N o n - s l i p p e r y . C h e m i c a l resistant . S t a i n p r o o f . L i g h t c o l o u r e l .

8. C e r a m i c tile s o f porcelain o r n a t u r a l c l a y a r e t h e m o s t satisfactory . O r d i nary l i n o l e u m a n d c o n c r e t e a r e u n s u i t a ble b e c a u s e t h e y a r e r e a d i l y a t t a c k ed b y the p r o c e s s ing s o l u t ion s .

9. W a l l s / c e i ling . L i g h t i n c o l o u r t o reflect a s m u c h l i g h t a s p o s s ible i n t o t h e w o r k i ng s u r f ace . S h o uld be e a s y t o w p e o r c l e a n . T h e w a l l s s h o u l d be c o v e r ed w i t h c h e m i cal -r e s i s t a n t m a t e r i a l s s u c h a s s p e cial p a i n t , v a r n i s h , c o n c r e t e o r c e r a m i c t i l es .

10. E n t r a n c e S i n g l e d o o r s y s t e m D o u b l e d o o r s y s t e m M a z e t y p e d o o r e n t r ance . R o t a t i ng d o o r s y s t e m .

11. D a r k r o o m i l l u m i n a t ion . 1 , S A F E L I G H T : • M i n i m u m d i s t a nce o f 1 . 2 m f r o m t h e w o r k i ng s u r f a ce . • B e s t f o r l o a d i n g a n d unloading a r e a s . • V o l t a g e o f s a f e l i g h t s h o uld n o t e x c e e d 2 5 w a t t .

12. 2 , W H I T E L I G H T . • U s e d f o r i n s p e ction a n d m a n t a i n a n c e o f c a s s e tte a n d s c r e e n s . • C l e a n i n g o f w o r k s u r f a ce . • S e r v i c i n g o f e q uipmen ts . • C h a n g i n g o f s o l u t i ons .

13. D a r k room E quipmen ts . A u t o m a t ic p r o c e s s o r . M a n n u a l p r o c e s s o r P r o c e s s ing chemicals . H a n g e r s f o r s u s p e n d i n g f i l m . C a s s e t t e . P a s s b o x S a f e l i g h t W h i t e l i g h t

14. M A N N U A L P R O C E S S I N G T h e r e a r e 4 t a n k s i n p r o c e s s ing p r o c e d u r e v i z ; D e v e l o p i n g R i n s i n g F i x i n g W a s h i n g D r y i n g

15. H a n g e r s . A f i l m h a n g e r i s a n i n s t r ument o r d e v i c e f o r holding r a d i o g r a phic f i l m d u r i ng processing p r o c e d u r e .

16. C a s s ette . U s e d t o h o l d the x-ray f i l m ( e x p o sed o r u n e x p o sed ) a n d i n t e n s i f y ing s c r e e n i n c l o s e a n d u n i f o rm c o n t a c t w i t h o n e a n o t h er . SIZE ; 1 7 " × 1 4 " 1 5 " × 1 2 " 1 4 " × 1 4 " 1 2 " × 1 2 " 1 2 " × 1 " 1 2 " × 8 " 1 2 " × 6 " ( O P G ) .

17. U s e s o f c a s s e tte . H o l d s i n t e n s i f ying screen and p r o t o col t h e m f r o m d a m a g e . E x c l u d e a l l light f r o m e n t e r ing t h e c a s s e t t e a n d f o g g i ng t h e f i l m . Mantain a c l o s e a n d uniform contact b e t w e e n s c r e e n a n d f i l m . E x c l u d e d u s t a n d d i r t f r o m t h e s e n s i tiv e f i l m s .

18. D R Y S I D E ? C o m p o n e n t s o f d r y s i d e - L o a d i n g b e n c h . C o m p a r t m e n t o f c a s s e t t e . F i l m s t o r a g e F i l m h a n g e r s

19. W E T S I D E ? ? T h e p r o c e s s i n g t a n k s c o m p r i s e t h e m a j o r e q u i p e m e n t o f t h e w e t s i d e o f t h e d a r k r o o m .