Abstract: In a radiation detector, a response is approximated as a primary delay system, and when a time constant T indicating the characteristic of the response is known, a final response value N0 is forecasted from dose rates or counting rates N1 and N2 of two points in the initial or middle stage of response. When the time constant T is unknown, the final response value N0 is forecasted from dose rates or counting rates N1, N2, and N3 of three points in the initial or middle stage of response. Simultaneously, a time constant is obtained and the soundness of the radiation detector is also evaluated. Thereby, a dose rate in an existence field of radiation or a counting rate in an existence field of radioactive materials is quickly and accurately forecasted, whereby the measurement time is shortened.

Abstract: In a radiation detector, a response is approximated as a primary delay system, and when a time constant T indicating the characteristic of the response is known, a final response value N0 is forecasted from dose rates or counting rates N1 and N2 of two points in the initial or middle stage of response. When the time constant T is unknown, the final response value N0 is forecasted from dose rates or counting rates N1, N2, and N3 of three points in the initial or middle stage of response. Simultaneously, a time constant is obtained and the soundness of the radiation detector is also evaluated. Thereby, a dose rate in an existence field of radiation or a counting rate in an existence field of radioactive materials is quickly and accurately forecasted, whereby the measurement time is shortened.

Abstract: A furnace throat monitoring camera monitors the throat of a blast furnace through an opening defined in a surrounding wall of the throat. The furnace throat monitoring camera includes a wide-angle lens system for producing an optical image representing a condition in the throat, a zoom lens system for varying a size of the optical image produced by the wide-angle lens system, and an imaging device for capturing the optical image varied in size by the zoom lens system. The zoom lens system and the imaging device can be tilted in unison with each other by a tilting unit to observe any area of the optical image produced by the wide-angle lens system.