Text Mining Analysis of Radiological Information from Newspapers as Compared with Social Media on the Fukushima Nuclear Power Plant Accident
Reiko Kanda*, Satsuki Tsuji*, and Hidenori Yonehara**
*National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage-ku, Chiba 263-8555, Japan
**International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
After the nuclear meltdown incident at Tokyo Electric Power Company’s Fukushima Daiichi nuclear power plant in March 2011, citizens are increasingly concerned about the adverse effects of radiation on health. Perception and anxiety about risks have been worsened by inaccurate news reports and a lack of information about the incident. In this research, newspaper headlines from March 2011 to January 2012 on the Fukushima incident were comprehensively collected and analyzed using text mining. Extracted data were also compared to information transmitted via social media such as Twitter during the same period to examine the following four issues related to features of the two types of transmission, i.e., newspaper headlines and social media, and the relationship between information from the media and anxieties about the adverse effects of radiation on health. 1) Over 10 months after the nuclear meltdown incident, the information most frequently provided by newspapers was that related to radiation measurement and surveys but providing few articles directly related to adverse effects of radiation on health. 2) Newspaper headlines combined multiple topics in short transmitted text while, at the same time, the limited information transmitted by social media was exaggerated. 3) Newspapers indirectly explained the adverse effects of radiation on health using concepts such as “danger/risk,” “safety,” “anxiety/dissatisfaction,” and “security.” 4) Many articles used the term “danger/risk” in March 2011 before the degree of radiation exposure had been evaluated reliably.
-  R. R. Kasperson, O. Renn, P. Slovic, H. S. Browan, J. Emel, R. Goble, J. X. Kasperson, and S. Rtick, “The social amplification of risk: A conceptual framework,” Risk Analysis, Vol.8, pp. 177-187, 1988.
-  T. Konishi and K. Fujimori, “To parents and school personnel being anxious about the radiation damages on children,” Japanese Society for Traumatic Stress Studies (in Japanese),
http://220.127.116.11/wp/wp-content/uploads/2012/11/konishifujimori0324.pdf [accessed Sep. 8, 2014]
-  H. Kishikawa, R. Murayama, A. Fujinaga, N. Nakaune, and I. Uchiyama, “Characteristics of information- gathering about radiation risk after the Great East Japan Earthquake,” The proceedings of the 26th Annual Meeting; of the Society of Risk Analysis Japan, 2013 (in Japanese).
-  T. Kusumi, A. Miura, and K. Ogura, “The evaluation of the reliability of information on radioactive contamination in food due to Fukushima nuclear power plant accident (1),” The proceedings of the 52th Annual Meeting of Japanese Society of Social Psychology, Vol.19, 2011 (in Japanese).
-  K. Sano and M. Kikuchi, “Investigation on “risk uneasiness and the information needs” related to the radioactivity,” Proceedings of the 26th Annual Meeting; of the Society of Risk Analysis Japan, 2013 (in Japanese).
-  A.Miura, T. Kusumi, and K. Ogura, “Reliability to information media and high-order literacy – Investigation on the panel survey after the Disaster (1) –,” The proceedings of the 53th Annual Meeting of Japanese Society of Social Psychology, Vol.85, 2012 (in Japanese).
-  Md. F. Shah and O.Murao, “Foreigners’ Evacuation Behavior in the Great East Japan Earthquake: A Case of Iwaki City in Fukushima Prefecture,” Journal of Disaster Research, Vol.8, pp. 802-813, 2013.
-  A. Kametsu, “The roles of Twitters at the time of the Great East Japan Earthquake,” NRI Newsletter, Vol.103, pp. 1-3, 2011 (in Japanese).
-  C. Ogiue, “The inspection of rumors after the Great East Japan Earthquake,” Tokyo, Kobunsha, 2011 (in Japanese).
-  R. Kanda, H. Joshima, and S. Kobayashi, “Knowledge and Perception of Risk among Trainees on Radiation Protection Course,” Japanese Journal of Risk Analysis, Vol.7, pp. 67-73, 1995.