| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radioactive gas measuring device of small size and low cost, having a simple configuration, capable of measuringγray by suppressing positron annihilationγray in the background of theγray to be measured. <P>SOLUTION: The radioactive gas measuring device includes a radiation measurement cell which is provided with a flow-in piping and an exhaust piping for allowing flow-in and exhaust of radioactive gas containing nuclide to be measured and the nuclide which releases electron through the flow-in piping and exhaust piping, a radiation detector for measuring the radiation generated from radioactive gas, and a radiation collimator which allows the radiation measurement cell and the radiation detector to be communicated each other, and sets a predetermined radiation measurement geometric condition between the radiation measurement cell and the radiation detector. The inner wall area of the radiation measurement cell which the radiation detector estimates through the radiation collimator is set to be 1/2 or less of the entire inner wall area of the radiation measurement cell as a predetermined radiation measurement geometric condition. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
