TOKYO -- Japan's 5 yen coin is becoming more expensive to produce amid higher materials prices and an unfavorable exchange rate, raising the possibility that the per-coin production cost will ...

The Japanese 5-yen coin is about 22 mm in diameter and 1.5 mm thick, weighs 3.75 g and has a central hole 5 mm wide. We chose this coin for monitoring neutron exposure because it is widely ...