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Loda Griffeth


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Loda Griffeth

Seward Trip



July 4-11, 2001
Annual sensor rotations occur on each of the six towers within Alaska each summer. The trip to Seward was to not only conduct the sensor rotation but also sample lichen along a designated route. The lichen and soil samples through gamma spectroscopy analysis allow us to explore and monitor the various radionuclides concentrations within lichen and soil.
Prior to reaching Seward, I met with Stan Read (ADEC). We attempted to sample at an airstrip in the Cantwell area. Sampling did not occur due to lack of caribou lichen species in area.
The participants in the sensor rotation for the Seward station were as follows: David Leach (station manager), Larry Sanders (LANL), Orval Hart (LANL), Major Mauser (Army Nat’l Guard), Stan Read (ADEC), Gary Evans (ADEC), and Jeff Hickman (ADEC). A few problems were encountered surrounding the sensor rotation. There was difficulty loading the Seward station program into the station. It was determined that Windows 2000 is not a compatible program with the pearl/station programs needed for each station. In addition, a background radiation reading from the Seward station was noticeable lower than normal. It was determined that the PIC (Pressurized Ionization Chamber) sensor was sensitive to the metal bar it attached to. A rubber slip inserted between the sensor and the metal bar corrected the readings.
Adrienne Orr and I sampled for lichen along the Seward Highway from Seward to Anchorage. We were able to sample in two different locations along the highway. The lichen samples taken were within the Cladina family along with numerous soil samples. Shown below are photographs from the Seward trip.



Figure 1: Adrienne Orr sampling caribou lichen from a plot located along the Seward Highway, near Moose Pass.


Figure 2: The photograph provides a closer look at the lichen plot. This is one of three sampling plots at this location. We made other stops along the Seward Highway in search of more lichen samples.



Figure 3: Loda Griffeth is using a soil corer on loan from the NRM Department at UAF. Soil sampled at each plot. An additional core sampled outside of the plots, as shown above.
I continued the lichen sampling along the Denali highway from Cantwell to Paxson. I saw little to no lichen belonging to the Cladina family the first part of the Denali highway. The Stereocaulon lichen was abundant and therefore sampled. At approximately 60 miles from the town of Paxson, the Cladina lichen was abundant and samples taken.
The trip was successful. There was an increase in participation and interest for the Seward stations along with other stations within Alaska. We have many lichen and soil samples retrieved from various parts of Alaska. Although some the samples are not of the same species or family, the samples will still be analyzed and then compared to like samples analyzed by us and through published literature. Lichen and soil sampling is an ongoing process. Many more samples are being collected throughout Alaska for the project.


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