Wall Street banks operating in Japan are inviting nuclear physicists to inform Tokyo employees about radiation risks, providing counseling and supplying bottled water to calm workers and keep them in the city.

Goldman Sachs Group Inc. has hosted three nuclear specialists and held sessions on emergency preparedness and family welfare, said Hiroko Matsumoto, a spokeswoman in Tokyo. Morgan Stanley asked two scientists to speak to staff and their families over the coming week and is importing water from Hong Kong, said Mika Watanabe, a Tokyo-based spokeswoman.

U.S. investment banks want staff to focus on business opportunities in Japan as the nation turns to rebuilding areas devastated by the Tohoku earthquake and tsunami, analysts said. Tokyo Stock Exchange President Atsushi Saito has led criticism of some foreign investors for a lack of commitment toward the domestic market following the disaster.