| 摘要 |
PURPOSE:To measure the radioactivity density at a high accuracy and quickly with an appropriate dilution of a sampling liquid by roughly measuring the radioactivity level of a fluid in a passage to match the measuring range of a radioactivity detector for precision measurement with the control of the dilution. CONSTITUTION:When the radioactivity level of a fluid in a passage 1 with a first radioactivity detector 2 exceeds the set value, a controller 17 computes the radio between the intake of the fluid and the quantity of a dilution fluid from a dilution tank 5 to ensure an accurate detection of the radioactivity with a second radioactivity detector 16. According to the results of the computation, valves 12 and 14 are controlled to regulate the dilution level of the fluid diluted of an agitator 6 properly. Then, the radioactivity of the fluid properly diluted as sampled via a valve 15 is detected with the detector 16 thereby enabling a highly accurate and quick detection of the radioactivity density. |
