In a famous case in 1954 a Japanese fishing boat was contaminated with fallout from a US test, resulting in serious illness in the crew, one of them dying (Richards & Zavales 1996, p. 54). By 1962, as large tests by the US and USSR continued, atmospheric radioactivity had increased significantly, and there was concern about contamination of the food supply. There was particular concern that iodine-131, which accumulates in milk and presents a hazard to young children, was reaching a dangerous level (Richards & Zavales 1996, p. 72). Richards, Paul G.; Zavales, John (1996), "Seismological Methods for Monitoring a CTBT: The Technical Issues Arising in Early Negotiations"(PDF), in Husebye, Eystein S.; Dainty, Anton M. (eds.), Monitoring a Comprehensive Test Ban Treaty, NATO ASI Series, vol. 303, pp. 53–81, ISBN978-94-010-4187-4. Richards, Paul G.; Zavales, John (1996), "Seismological Methods for Monitoring a CTBT: The Technical Issues Arising in Early Negotiations"(PDF), in Husebye, Eystein S.; Dainty, Anton M. (eds.), Monitoring a Comprehensive Test Ban Treaty, NATO ASI Series, vol. 303, pp. 53–81, ISBN978-94-010-4187-4.
Storchak et al. 2015, p. 51. Storchak, D. A.; Di Giacomo, D.; Engdahl, E. R.; Harris, J.; Bondár, I.; Lee, W.H.K.; Bormann, P.; Villaseñor, A. (February 2015), "The ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009): Introduction", Physics of the Earth and Planetary Interiors, 239: 48–63, Bibcode:2015PEPI..239...48S, doi:10.1016/j.pepi.2014.06.009.
Storchak et al. 2015, pp. 50, 52. Storchak, D. A.; Di Giacomo, D.; Engdahl, E. R.; Harris, J.; Bondár, I.; Lee, W.H.K.; Bormann, P.; Villaseñor, A. (February 2015), "The ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009): Introduction", Physics of the Earth and Planetary Interiors, 239: 48–63, Bibcode:2015PEPI..239...48S, doi:10.1016/j.pepi.2014.06.009.
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Storchak et al. 2015, p. 51. Storchak, D. A.; Di Giacomo, D.; Engdahl, E. R.; Harris, J.; Bondár, I.; Lee, W.H.K.; Bormann, P.; Villaseñor, A. (February 2015), "The ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009): Introduction", Physics of the Earth and Planetary Interiors, 239: 48–63, Bibcode:2015PEPI..239...48S, doi:10.1016/j.pepi.2014.06.009.
Storchak et al. 2015, pp. 50, 52. Storchak, D. A.; Di Giacomo, D.; Engdahl, E. R.; Harris, J.; Bondár, I.; Lee, W.H.K.; Bormann, P.; Villaseñor, A. (February 2015), "The ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009): Introduction", Physics of the Earth and Planetary Interiors, 239: 48–63, Bibcode:2015PEPI..239...48S, doi:10.1016/j.pepi.2014.06.009.
