Radiation

Archived from radmon.org - originally posted 27/08/2019 This is a list of the common radioactive sources available on ebay (at the time of writing - 31/08/2019) They vary a lot in radioactivity and I own all of these so I will try and give you my opinion of how active they are using an SBM-20 tube, in a rough, roundabout way. They will be marked 1 to 5 (5 being most active) based on the samples I own and based against each other. Where I have included the emission type (a, b & y (alpha, beta & gamma)) this is the overall emission. A lot of the different radiation types are caused from

Archived from radmon.org - originally posted 25/08/2019 On a radmon.org forum thread we sort of got to discussing the thickness of Aluminium for shielding beta but I didn't want to divert that thread too much so started a new thread on this subject here. I had quoted, roughly in all honesty, that 5mm aluminium would do well for beta shielding and was met with this reply by user FSM19: For a beta shield you need 3mm of aluminium, foil isn't thick enough, UK Civil Defence geiger counters and ionisation instruments, such as the Meter Doserate Portable No 1 Trainer, Meter Doserate Portable No 1

Archived from radmon.org - originally posted 19/07/2017 Blackpool UK - 19 July 2017 - Started around 17:00 BST / 16:00 UTC During quite a downpour today, 20mm in one hour. At it's peak was 65mm/h. Background radiation increased by approx 50% / 11CPM over a 2.5hour period. Not much by any means but still an indication there was some radioactive substance in the rain. Please note the Radmon graphs are UTC and the rain graphs are BST (UTC + 1) and so there is an hour difference between them. What caused it? I could be anyone's guess. Radon causing decay products to get caught up in the rain?

Archived from radmon.org - originally posted 04/04/2016 I have finished up building/setting up my home radiation monitoring station and is all up and running. :cheer: https://www.schmoozie.co.uk/radmon/ (currently offline.) I won't go into too much detail as it is pretty much just a NetIO GC10, in an enclosure with a couple of buttons and switches added. It is mounted outside under a canopy on my workshop so rain is no issue and I have used all sealed switches/buttons etc with rubber gaskets on each to seal it up nicely. The window for the tube at the front is covered with some Kapton tape to

Archived from radmon.org - originally posted 20/03/2016 After some more testing and investigation I found the issue in sketchy GPS was actually the code. I've fixed it and the results are much, much better. There is just one tiny issue now where the CPM being read from the counter is recorded occasionally with an extra digit or two counts on one record. I reckon once that is sorted I can call it version 1.0 :) I have updated the download link with the latest code. Here are the results so far: https://www.google.com/maps/d/edit?mid=zasLAdbQXqtw.kInoUYbBsJO8&usp=sharing I changed the way

Archived from radmon.org - originally posted 19/03/2016 I have sorted the battery issue by adding a couple of 18650 Lipo's and a buck converter to regulate the voltage to 5.0V. That seems to be holding up well. The entire unit (logger and counter) consume about 10ma at 20CPM background radiation so roughly working out if my batteries are 2000mAh (they state 2600mAh but I doubt I will get that) and the unit uses 10mA then it should last for around 200 hours! I just need to sort a charging circuit now to charge the batteries when the unit is powered from 12v from the car, or mains adapter. I

Archived from radmon.org - originally posted 17/03/2016 I recently bought myself a DP-66M from ebay, then another one, then a NetIO GC-10 and I have another on the way. Maybe a different one soon? It's fair to say I have been bitten by the Geiger counter bug! I am building a static outdoor monitoring station at home, monitoring 24/7, but currently waiting on parts from China. In the meantime I have been playing with the GC-10 and built a prototype mobile GPS logging unit to take on my travels. I live not too far from Heysham power station and the Westinghouse Springfields nuclear fuel