OZONE CONCENTRATION MEASURING DEVICE

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PROBLEM TO BE SOLVED : To provide an ozone concentration measuring device equipped with an ultraviolet fluorescent lamp having a long lamp lifetime, capable of preventing an influence on the skin, eyes or the like of a human body, and suppressing deterioration of the inside of the device.SOLUTION : The ultraviolet emission fluorescent lamp having a phosphor layer including a vacuum ultraviolet light excitation phosphor comprising a gadolinium-activated rare earth aluminum-scandium borate expressed by a general formula (Y1-xGdx)Al3-yScy(BO3)4(0

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