DIY radiation detectors may reflect people taking safety into their own hands rather than relying on the government for information.
Individuals and small groups have been taking safety into their own hands by creating, modifying and networking their own Geiger Counters, or radiation detectors. In Japan for instance, a Kickstarter project aims to distribute Arduino-based Geiger counter shields throughout the country. In another example, through using Pachube, a realtime data infrastructure platform for the Internet of Things, managing millions of data points per day, people have plotted areas on a map where they have detected abnormal radiation levels. Other sources, such as Makezine, offer resources for concerned citizens to build their own radiation detectors.
By networking this information out over the Internet, it seems people are not relying governments for their health. See the video below for an example of a DIY Geiger Counter: