Mobile phone operator Softbank has started selling smartphones with radiation detectors.
Apparently people are so concerned that radiation is spreading out along Japan's eastern coast more than a year after the Fukushima crisis that they need re-assuring.
Parts of north-eastern Japan are still off-limits due to high radiation levels after the Fukushima nuclear plant and anti-nuclear sentiment is high.
According to Reuters, groups in Tokyo and other cities are calling for radiation monitoring at schools and other public facilities.
Softbank thinks that the threat from the nuclear accident is a concern for particularly for those with small children.
Softbank founder and president, Masayoshi Son, standing in front of an aerial photo of the crippled plant thinks that this means that people will want a smartphone which tells them if radiation levels are too high.
The smartphone in the company's "Pantone" series will come in eight bright radiative colours. In each will be customised IC chips made by Sharp that measure radiation levels in microsieverts per hour.
The phone will hit the shops in summer will keep track of each location a user tests for radiation levels.
Son is a critic of nuclear power and advocate of renewable energy sources. He told hacks that the smartphone was more portable and user-friendly than conventional Geiger counters.