USA, CA, Bodega Head (sensor 78)

5年前 5年前
83cpm 5492cpm
0.086μSv/h 5.721μSv/h
Model :nGeigie V2.1.5
Alarm :150

Seawater Probe

“USA, CA, Bodega Head” に 16 件のコメントがあります

  1. Dan Sythe

    The Bodega head sensor became damaged by salt water intrusion when the connector degraded. Please see attached photo. We are going to re engineer the sensor so that this does not happen again. The high readings at the end of its life were due to noise created by the salt water intrusion and not elevated radiation levels.

  2. Paul-André

    Why has the Bodega Marine Lab been off site for so long?

  3. Dan Sythe

    We are seeing some transient spikes that we think are related to maintenance activities. I am checking with site maintenance crew. The overall background reading has been steady.

    • Ross

      Just noting that probe has been pulled by Marine Lab Staff for us to examine back at Medcom lab.

    • Arnie

      In the coicmlpated world we live in, it’s good to find simple solutions.

  4. Dan Sythe

    There seems to be a sporadic noise issue at the site. Will get there as soon as I can to diagnose.

  5. Dan Sythe

    Ross diagnosed recent failure, which was due to router failure – possibly due to power surge at probe site. Itʻs back online.

    • Bertha

      You may find the OSA screening test at a useful tool. It provides a thorough OSA screening test and provides a very useful report that gets emailed back to the user.

  6. Ross

    We are investigating the 3.30.16 outage…

  7. Ross

    The building housing this probe is subject to inundation during Pacific storms. This area of California is also prone to loss of electric service each storm season, and backup power to this station may be limited. These factors may have contributed to the data drop-out around Christmas 2015.

  8. Kent Noonan

    The geiger tube used here is the LND 78017. 960 CPM/uSv/hr conversion factor.
    Specifications :

    • Ross

      Thanks Kent; I added model number next to Cal factor at top here so it remains ‘sticky’.
      Please post about your discovery and examination of the bump in levels beginning early July.
      Our host has responded and will check the installation for anomalies.

      • Julissa

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  9. Dan Sythe

    For now we are not publicizing the exact location of this sensor, while we work out a formalized agreement with the host and we get through the beta test.

  10. Dan Sythe

    This is now live and the oldest portion of archived data is from testing done on dry land with a radioactive source.
    Weʻll be working on cleaning this up. The CPM is higher on this particular GM tube sensor, relative to the pancake detector many of us are accustomed to, due to the larger detector volume. The important data to watch with this sensor is uSv/h, which should be equivalent from sensor to sensor when measuring gamma radiation. Sea Water, being relatively dense, will rapidly absorb beta radiation.

  11. Ross

    Was installed Wednesday April 22nd 2015, Earth Day!