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Report No.
 - 

Countermeasure of Electromagnetic Wave Noise at Ionization Chamber Used Monitoring Posts

Hosotani, Risa ; Sato, Naomitsu*; Shimizu, Takehiko; KOBAYASHI, Hideo

To observe the airborne gamma radiation dose rate, monitoring posts are set up to a border of supervised area of JNC-OEC. Measurement values of some ionization chambers set at monitoring posts were increased by unknown origin signal at random times. To probe the cause, measurement of electric field intensity at the ionization chamber and immunity test at anechoic chamber are carry out. Result of examination made clear that measurement values are increased by specific frequency band electromagnetic wave. They were also clearly that ferrite cores and shield tube are effective as eliminate of an electromagnetic wave noise. When ferrite cores are attached to cables of ionization chambers, unknown increase of measurement value doesn't occur.

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