Effect of low-output He-Ne laser rays on the colony-forming ability of the cells of mice lymphoma.

The effect of low-output He-Ne laser rays on the survival of mouse lymphoma P388 cell cultures was studied on the basis of the colony forming ability. Irradiation with 1.3 and 9 joule of 5 and 10 mW He-Ne lasers, respectively, seemed to cause a relatively low cell necrosis. The survival curve did not show the shape characteristic of ionizing radiation.