Local medical staff are planning to strike over pay negotiations.

Medical physicists, who provide radiation services to cancer patients, are due to strike for five days at the end of the month.

In Dunedin, they'll refuse to work any overtime during the strike period.

Medical physicists elsewhere in the country also plan to strike.

They want more money, in line with what they can earn overseas.

This will be the first time medical physicists have gone on strike in New Zealand.