In the aftermath of the 2011 tsunami that severely damaged the Fukushima Daiichi nuclear power plant in Japan, reporters faced significant uncertainty regarding radiation exposure in the affected area. The disaster triggered multiple fuel meltdowns, raising urgent questions about safety for both residents and journalists operating near the exclusion zone.

To navigate this hazardous environment, the Tokyo bureau of a major news organization obtained a Russian-made Soeks Geiger counter, a compact device roughly the size of a cellphone. The meter displayed radiation levels in microsieverts per hour—an internationally recognized measurement unit—alongside a straightforward color-coded alert system: green indicating safe conditions, yellow suggesting caution, and red signaling danger.

Armed with the device, correspondents ventured deep into the exclusion zone, a sprawling area where the clocks were famously frozen at the moment of the earthquake and tsunami at 2:46 p.m., and where deserted homes and abandoned livestock created an eerie landscape. At one location behind an empty residence, the Geiger counter registered radiation levels as high as 14 microsieverts per hour, significantly exceeding normal background levels typically around 0.1 microsieverts per hour.

Despite these elevated readings, the invisible nature of radiation posed a psychological challenge. Individuals present in the zone, including evacuees accompanying journalists, sometimes displayed casual attitudes toward the risk, such as removing protective gear to smoke. The tension between measurable danger and human behavior underscored the complexity of covering a nuclear disaster firsthand.

The experience raised lingering concerns about long-term health implications for those exposed to elevated radiation levels. Journalists, who regularly used the Geiger counter to monitor their surroundings, sought to minimize exposure by retreating when readings spiked. The device became a vital tool for making real-time assessments and mitigating risk amid uncertain and potentially hazardous conditions.

Hiroko Tabuchi, who reported from Tokyo and covered business before focusing on pollution and environmental issues, reflected on how the use of such technology contributed to safety during reporting in Fukushima’s exclusion zone. The device’s ability to provide immediate feedback on radiation helped journalists navigate one of the most dangerous nuclear incidents in recent memory, balancing the imperative to document the aftermath with the need to protect their health.