| 摘要 |
PURPOSE:To achieve a higher accuracy and a shorter measuring time by varying an input level into detector while using a plurality of collimation glasses with a subdivided measuring range to enable the measurement of the detector in the maximum sensitivity. CONSTITUTION:An ultraviolet ray source 1 and a power source 10 are operated to radiate the ultraviolet rays with the wavelength of 300-400nm. Four of collimation glasses 7I, 7II...7IV are measured sequentially and memorized at each range thereof. Then, sample glasses 6I, 6II...6VI are initially measured at such a high level as 1,000 roentgen and compared with level values previously memorized to screen the range at which measurement should be made. Remeasurement is done at a specified range and the results thereof are compared with input of the collimation glasses at the corresponding range to determine a dose value. |
