| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radiation measuring apparatus that can perform dust collection of sample gas, which is discharged from a disposal facility for volume reduction of radioactive material, by using mobile type filter paper. <P>SOLUTION: An outside air introduction part is connected to a sample gas capturing and transferring part, which captures sample gas from a facility chimney, to introduce outside air into the sample gas and dilute the sample gas, so that an acid dew point of the sample gas after the dilution is lowered. The sample gas contains acid gas and water vapor, such that a device develops corrosion degradation at or below a temperature of an acid dew point due to generated acid, and further water vapor condenses and adheres to a flow channel, thus causing difficulties in performing correct dust collection. However, at a lowered acid dew point of the sample gas after the dilution, the temperature of the sample gas to be transferred to a dust collection part can be maintained at or above a temperature of an acid dew point of the sample gas after the dilution, and below a temperature of an acid dew point of the sample gas before the dilution. By introducing outside air to the sample gas, it is possible to use mobile type filter paper having a temperature specification of which upper limit is lower than that of fixed type filter paper, thus extending a maintenance period. <P>COPYRIGHT: (C)2012,JPO&INPIT |
