| 摘要 |
PURPOSE:To measure the quantity of a thermal neutron by forming a thermal neutron monitoring element in a shape of a wafer by sintering boron at a high temperature. CONSTITUTION:Boron in powder form is put into a high temperature and high pressure furnace, and sintered in a shape of a wafer, for instance, of about 1mmX10mmphi. By using a thermal neutron monitoring element 100 which has been manufactured in this way, a gas emission quantity absolute measuring device is constituted. At the time of a measurement, the element 100 is put into a main vacuum tank 1, and an exhaust is executed up to a superhigh vacuum area by a main exhaust pump 13. Subsequently, a valve 14 is closed and an electron beam is irradiated toward the element 100 from a filament 7 by a sample temperature control device 5, a temperature is measured by a thermocouple 11 and a temperature of the element 100 is raised, and after it has reached a set temperature, the quantity of gas emitted from the element 100 for a prescribed time is measured by a mass analyzer 4.
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