Flux monitor, copper

Irradiation I. The samples and standards (with appropriate flux monitors) are individually exposed to a neutron flux of 1 X 1013 neutrons cm"2 sec-1 for periods of V2 min for fly ash and 1 min for coal via a pneumatic rabbit system. The samples are irradiated and counted individually because of the short half-life of the (n/y) products of some of the elements and the requirement of counting at a specific time after irradiation. A copper flux monitor is irradiated with each sample to allow... 

Three sets of flux spectrum monitors are included in each capsule assembly. Each detector is placed inside a sheath which identifies the material and facilitates handling. Cadmium covers are used for those materials (e.g., uranium, nickel, copper, cobalt and neptunium) which have competing neutron capture activities. 

The main interest in coupling QCM with SECM is that the SECM tip can specifically monitor the flux of electroactive species associated with the surface electrochemical process. This additional information can help to quantify the actual contribution of electroactive flux to the apparent total mass change derived from the QCM frequency shift The combination of SECM with EQCM was initially described by Hillier and Ward [160]. The authors used an SECM tip to trigger the electrodeposition of a small amount of copper on predefined locations of the QCM surface. By monitoring the ensuing frequency shift of the QCM, the radial sensitivity of the QCM crystal was mapped. 

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