Background An earthquake of 9.0 magnitude, followed by a tsunami, hit Japan in 2011 causing widespread destruction. Fukushima Nuclear Power Plant had been damaged, causing a spread of radioactive materials. Objectives The aim of this study was to assess personal willingness to respond to a disaster as a part of an international delegation, to an area with unknown and unclear risk of radioactive materials. The Israeli delegation to the Japan 2011 earthquake had been chosen as a case study. Method The survey was conducted during the first two weeks after the tsunami in Japan. The population was selected randomly. After distributing the survey form, 94 anonymous answers were received, which give a 69% participation rate. The sample was divided into two groups (participated or didn't participate in an international delegation in the past). Results It was found that as the situation on the ground became worse, the willingness to be deployed dropped dramatically, although no significant difference was found in willingness between the two study groups. When both groups were combined into one group, significant differences were found in their willingness to be deployed in a delegation between the three levels (no radioactive leak, possible radioactive leak, and uncontrolled leak). Conclusions The willingness to serve on a delegation that responds to a scene with a potential radioactive leak will be dramatically influenced by the risk at the site.