Radiation Protection Dosimetry Advance Access published online on October 21, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncn260
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EXPOSURE ASSESSMENT AND OTHER CHALLENGES IN NON-IONISING RADIATION STUDIES OF CHILDHOOD LEUKAEMIA
1 UCLA School of Public Health, Department of Epidemiology, Los Angeles, CA, USA
2 Department of Epidemiology, University of California, Los Angeles, CA, USA
* Corresponding author: kheifets{at}ucla.edu
Studies of electromagnetic fields (EMF) and the development of childhood leukaemia face unique difficulties. EMF are imperceptible, ubiquitous, have multiple sources, and can vary greatly over time and distances. Childhood leukaemia and high average exposures to magnetic fields are both quite rare. Thus, a major challenge in EMF epidemiology is the small number of highly exposed cases and the necessity for retrospective assessment of exposure. Only studies designed to minimize bias while maximizing our ability to detect an association, should one exist, would have a potential to contribute to our understanding. New approaches are needed; the most promising in the extremely low-frequency range involves a study of a highly exposed cohort of children who have lived in apartments next to built-in transformers or electrical equipment rooms. Another promising avenue is an investigation of possible joint effects of environmental exposures and genetic co-factors. An exposure assessment methodology for residential radiofrequency fields is still in its infancy. Rapid changes in technology and exponential increases in its use make exposure assessment more difficult and urgent.