Abstract: In a method for the measurement of the distribution of the inclusions in a slab by electron beam irradiation, an electron beam of relatively large diameter is irradiated onto a relatively large specimen of the slab and a spectrum analysis of the characteristic X-rays is effected by using planar analyzing crystals, in order to obtain the data of the two-dimensional distribution of the elements of the inclusions in the surface of the specimen.

Abstract: The present invention is a monitor for the priority level of tasks in a computer in which priority levels are assigned to tasks in such a manner that a higher priority level is assigned with a shorter time. During the period when a task assigned with an optional priority level is processed, its processing time is measured and recorded by means of a level timer. In case a second task with a high priority level interrupts the first task and the processing is suspended, the measuring and recording of time are stopped, and the measured and recorded values are stored. When the processing of the second task is completed and the processing of the first task is started again, measuring and recording are started again from the stored values. When the processing time of the first task exceeds the processing time assigned to its priority level, the processing of the first task is suspended and a warning is issued.