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ARTICLE
Year : 2010  |  Volume : 33  |  Issue : 3  |  Page : 100-103

Radiochromic dosimeter for nuclear emergency


Nuclear Radiation Management and Applications Division, Defence Laboratory, Jodhpur, Rajasthan, India

Correspondence Address:
S G Vaijapurkar
Nuclear Radiation Management and Applications Division, Defence Laboratory, Jodhpur, Rajasthan
India
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Source of Support: None, Conflict of Interest: None


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The indigenously developed Radiochromic film will provide visual assessment of absorbed radiation dose in cGy range. The film develops a distinctive and characteristic color upon exposure to ionizing radiation. When the active monomer polymer strip is exposed to ionizing radiation, a polymerization reaction immediately produces an intensely colored dye polymer that changes the appearance of the dosimeter. The amount of dye produced is proportional to the radiation dose. The dye polymer is cyan blue with a major absorbance peak at 676-680 nm and a minor peak at 625-630 nm. The developed film indicates progressively darker in proportion to absorbed dose in six different shades i.e. 0cGy, 10cGy, 25cGy, 50cGy, 125cGy and 350cGy. The progressively increase in darkness of same film is also observed by naked eye at 500cGy, 750cGy and 1000cGy.The dose response (10cGy to 1000cGy), dose rate response (10CGy/h- 1200cGy/h), sun light and room light effect on radiochromic film has also been studied. Sun light and room light effect on radiochromic film and color stability has also been studied. It is observed that the dosimeter is unaffected by exposures to sunlight or normal room light if radiation sensitive strip is covered by clear transparent UV protective film.


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