ULTRAVIOLET RAY FLUORESCENT LAMP FOR ARTIFICIAL ACCELERATION/EXPOSURE TEST OF POLYMERIC MATERIAL

PURPOSE:To reduce the measurement error by using a phosphor with the specific spectral emission characteristic. CONSTITUTION:A specific phosphor is used so that the radiation energy passing a bulb is increased by 5-17 times as the wavelength is increased by 5nm between the radiation wavelength of 295-310nm and the radiation energy becomes the maximum between 305-325nm, and the leading edge of the spectral distribution on the short wavelength side is made sufficiently sharp. One example of this phosphor is cerium-activated lanthanum phosphate, and the cerium activation quantity is set within the range of 0.05-0.4mol, preferably within the range of 0.1-0.3mol. The increasing rate of the radiation energy near 295-310nm becomes approximate to that of the solar rays by the absorption characteristic of the ultraviolet ray transmitting glass and the radiation energy characteristic of the phosphor. Accordingly, the abnormality deterioration or the like does not occur in the test, and the measurement error can be reduced correctly.