USA, CA, Bodega Head (sensor 78) Offline long 7 months ago 7 months ago 83cpm 5492cpm 0.086μSv/h 5.721μSv/h More sensor data Sensor:LND78017 Alarm:150 102Seawater Probe (CAL 960 CPM/µSv/hr); Geiger tube is the LND 78017. Note that CPM readings may be higher relative to North American terrestrial sensors, as the tube used for this Seawater probe is more sensitive than most. Probe with nGeigie. Prior to installation Poly-wrapped Probe in Seawater Sump.Seawater form center of a small bay circulates continuously through this sump. Various other sensors share the sump. Sediment around Probe.Sump and Probe are cleaned periodically. Sump can fill with kelp, sand and small marine organisms, so requires cleanout, especially under rough ocean conditions. 16 Responses to “USA, CA, Bodega Head” Dan Sythe March 6, 2017 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. Reply Paul-André February 25, 2017 Why has the Bodega Marine Lab been off site for so long? Reply Dan Sythe December 10, 2016 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. Reply Ross December 15, 2016 Just noting that probe has been pulled by Marine Lab Staff for us to examine back at Medcom lab. Reply Arnie February 27, 2017 In the coicmlpated world we live in, it’s good to find simple solutions. Reply Dan Sythe November 29, 2016 There seems to be a sporadic noise issue at the site. Will get there as soon as I can to diagnose. Reply Dan Sythe May 7, 2016 Ross diagnosed recent failure, which was due to router failure – possibly due to power surge at probe site. Itʻs back online. Reply Bertha July 20, 2016 You may find the OSA screening test at MySlTepeest.com a useful tool. It provides a thorough OSA screening test and provides a very useful report that gets emailed back to the user. Reply Ross April 11, 2016 We are investigating the 3.30.16 outage… Reply Ross December 28, 2015 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. Reply Kent Noonan July 13, 2015 The geiger tube used here is the LND 78017. 960 CPM/uSv/hr conversion factor. Specifications : http://www.lndinc.com/products/406/ Reply Ross July 13, 2015 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. Reply Julissa July 20, 2016 Normally I do not learn article on blogs, but I wish to say that this write-up very colpelmed me to take a look at and do it! Your writing taste has been amazed me. Thank you, quite nice post. Reply Dan Sythe April 25, 2015 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. Reply Dan Sythe April 23, 2015 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. Reply Ross April 22, 2015 Was installed Wednesday April 22nd 2015, Earth Day! Reply Leave a Reply Click here to cancel reply. Name (required) Email (will not be published) (required) Website Comment Select an image for your comment (GIF, PNG, JPG, JPEG):Please input characters displayed above.