FREE: JAPANESE 5 YEN COIN USED FOR RADIATION TESTING READ MORE

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PHOTOS ARE NOT ACTUAL COIN THIS IS DONE SO YOU CAN SEETHE DETAIL,TO DESCRIBE THE COIN YOUR BIDDING ON ITS A UNC.63+ EASY,HOWEVER IT HAS CHANGED TO A REALLY DARK METALLIC RAINBO TYPE COLOR ALMOST LIKE OIL ON WATER ,AND IT JUST SHOWED UP BLACK ON THE CAMERA BUT GORGEOUS COINNOW HERES THE BACK STORY READ ON ITS VERY INTERESTING
The Japanese for "five yen," go en (??) is a homophone with go-en (??), "en" being a word for fate or destiny, and "go" being a respectful prefix.
Use in nuclear accident investigation
Following the nuclear accident at Tokai, Ibaraki in 1999, physicists showed how this coin could be used to estimate neutron dosage to the surrounding population, by measuring its zinc isotope ratios. The Japanese 5-yen coin is about 22 millimeters in diameter and 1.5 mm thick, weighs 3.75 grams and has a central hole 5 mm wide. We chose this coin for monitoring neutron exposure because, the zinc content is precisely controlled, and the 65Zn generated has a convenient half-life (244.1 days) and gamma ray energy emission (1,115.5 keV). To obtain a record of the dosage of neutrons released as a result of the accident, we collected exposed coins from people's houses at distances 100–550 m from the facility.[1]
They concluded that the coin could offer information about the total neutron effect during the accident, and about shielding by modern Japanese houses, given that the coins were recovered from indoors.
The 5 yen coin (????, Go-en k?ka?) is one denomination of Japanese yen. The front of the coin depicts a rice plant growing out of the water, with "five yen" written in kanji; the back is stamped with "Japan" and the year of issue, also in kanji, separated by sprouts of a tree. The three graphic elements of the coin represent agriculture, forestry and fisheries, the key elements of the Japanese first-sector economy. Around a hole, there is a gear that represents industry. It is the only Japanese coin in circulation to lack Arabic numerals on either face.