Observation of Radiation
Japanese photographer Masamichi Kagaya succeeded in taking pictures of radiation contaminated objects to indicate how they are contaminated.
Mr. Kagaya developed this technique with a help from Mr. Satoshi Mori, an emeritus professor of the University of Tokyo. An object under radio-active contamination was put on a special plate coated with material photosensitive to doses. Part where radioactive materials are adhered looks dark.
A gamma camera was also developed by Japanese makers and is now used for recovery work in Fukushima Daiichi. This camera can show in real time locations contaminated and their intensity of contamination.
http://www.imart.co.jp/houshasen-level-jyouhou-old7.21.html
However, if you are exposed to or come near to the location colored red or yellow, you will receive a fatal dose in minutes or an hour or so.
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1Co 4:20 For the kingdom of God is not in word, but in power.
1Co 4:21 What will ye? shall I come unto you with a rod, or in love, and in the spirit of meekness?