Whining in the earphone, CDV-700 by ENi, often a problem. Several causes have been located and documented ( bad electrolytic filter, bad transistors, bad...
56
GEOelectronics
k0ff
Sep 17, 2006 2:16 pm
In NE MO where I live and have the Home Lab, background radiation runs around 10 uR/H from natural sources, mostly K-40. This radiation field will give far...
63
GEOelectronics
k0ff
Oct 1, 2006 12:56 pm
1 ATM ( atmospheric pressure) Ion Chambers, even of excellent modern design reach their low end at about 3 mR/H full scale. This is with every conceivable...
64
Jim RabidWolf
rahantubbe
Oct 2, 2006 3:57 am
On the other hand, there are several great advantages to the Ion Chamber ... For one thing, my 440 RF/C has a low range of 1 mr/H full scale, the older 440 is...
66
Robert Atkinson
robert8rpi
Nov 29, 2006 3:33 pm
Hi, We all (should) know that a standard digital multimeter (DMM) loads a GM power supply too much to get an accurate reading. A cheap and simple way to get a...
67
GEOelectronics
k0ff
Nov 29, 2006 6:29 pm
Q: Been looking for a calculator like this to help me calibrate some of my meters: http://www.radprocalculator.com/Gamma.aspx Probably been mentioned here many...
70
GEOelectronics
k0ff
Jan 4, 2007 12:03 am
Some Lucas cells ( see earlier article) work by drawing the air through with a pump and monitoring for Radon (or Thoron) on a continuous basis over a long ...
73
Robert Atkinson
robert8rpi
Jan 9, 2007 4:33 pm
Hi all, I've added some connector identification info to the photo's section of HomeRadLab. Feel free to add to it. Robert G8RPI....
74
Geo>K0FF
k0ff
Jan 9, 2007 9:16 pm
21st Century Amateur Rad Lab. Had a computer failure last month so decided to just replace the main desktop with something modern, and a flat panel display....
76
Geo>K0FF
k0ff
Feb 5, 2007 4:31 pm
Detector tubes do not detect Gamma rays directly very well. First the Gamma Ray must interact with an atom by one of several methods outlined in another ...
77
Geo>K0FF
k0ff
Mar 19, 2007 2:17 pm
NRC has signed agreements with the following States (called Agreement States) enabling them to regulate source, byproduct, and small quantities of special...
79
Geo>K0FF
k0ff
Mar 22, 2007 5:02 pm
UV LEDS are really "near UV" @ 395, 410 and 420 nm. Real UV is considered less than 370 nm. Advanced UV LEDs are @ 255, 265, 270, 280, 285, 290, 300, 310, 320,...
81
billg5x
Mar 25, 2007 2:42 pm
I thought this might be the appropriate group to post this. I place my fiestaware saucer (2.5-3mrh) on the door of the dryer when pulling static filled clothes...
83
Geo>K0FF
k0ff
Apr 6, 2007 12:51 am
The classic college physics experiment is to find out the "age" of thorium mantles by Gamma spectrometry. Although it may take 25 years for all the daughters...
84
Geo>K0FF
k0ff
Apr 7, 2007 1:46 am
Gamma Energy Response of Detector Probes. A complicated issue, let's shed some light on it and simplify. First what is energy level as applied to nuclear...
85
Geo>K0FF
k0ff
Apr 7, 2007 2:27 am
Unfortunately most all GM and scintillation detectors are "energy dependant". Basically this means the number of pulses the probe will give off depends on the...
86
Geo>K0FF
k0ff
Apr 8, 2007 3:28 pm
Amazing what this fellow has done with almost no equipment: http://www.randomuseless.info/spectra/results/trinitite/ Have fun Geo...
88
Geo>K0FF
k0ff
Apr 8, 2007 5:44 pm
http://www.qsl.net/k0ff/Trinity%20Atom%20Bomb%20Site%20Picture%20Tour%20by%20Geo/ Captions will be added later, but the pictures are pretty self explanatory....
89
Geo>K0FF
k0ff
Apr 8, 2007 8:20 pm
What *IS* and What *IS NOT* a Geiger Counter Let's clear the air right away on this topic. Many newcomers to this fascinating hobby are introduced to their...
90
Geo>K0FF
k0ff
Apr 9, 2007 3:36 am
Mobile Rad Lab by Geo The RM-20 was selected as my mobile Geiger Counter for a few reasons. A) It was inexpensive and small. Also appears to be rugged. The...
93
Geo>K0FF
k0ff
Apr 10, 2007 12:53 am
Deadtime in Geiger Mueller Tubes >Tutorial by Geo Inside any discharge tube is a fill gas that ionizes when it encounters a charge that exceeds its breakover...
94
Geo>K0FF
k0ff
Apr 10, 2007 3:07 am
HV test meter multiplier >Project by Geo 10ea 99 Megs in series, 1/10% 990 MegOhms Goes in series with 10 Meg DVM to measure HV in Geiger Counters with...
96
Geo>K0FF
k0ff
Apr 10, 2007 6:28 pm
*Counters, Scalers, Ratemeters, SCAs, MCAs etc. >Tutorial by Geo* So now we have our first Geiger Counter. We know it's a GEIGER something because it has a...
98
Geo>K0FF
k0ff
Apr 14, 2007 1:44 am
Link to article of general interest concerning U and DU. http://www.qsl.net/k0ff/DU/ Geo...
99
Geo>K0FF
k0ff
Apr 14, 2007 12:43 pm
Generating Metastable Isotopes of Short Half-Life in the Home Lab >Tutorial by Geo "METASTABLE" - "m", small case m, when appended to an isotope name, means...
100
Robert Atkinson
robert8rpi
Apr 14, 2007 8:59 pm
Hi, We all (should) know that a standard digital multimeter (DMM) loads a GM power supply too much to get an accurate reading. A cheap and simple way to get a...
101
Geo>K0FF
k0ff
Apr 16, 2007 3:59 am
http://www.qsl.net/k0ff/Trinitite/ Have fun Geo...
102
Geo>K0FF
k0ff
Apr 17, 2007 3:11 pm
In 1903 Sir William Crookes discovered that Alpha radiation causes visible light flashes in a screen made from Zinc Sulfide powder. Soon he turned this...
103
Geo>K0FF
k0ff
Apr 18, 2007 9:23 pm
Raw pictures of the Gamma Spectroscopy Suite at GEOelectronics. GEOelectronics is this little table in my basement! It is also sometimes called NLNL/ New...
106
Geo>K0FF
k0ff
Apr 26, 2007 7:08 pm
Any samples to analyze in my spectrum analyzer would be appreciated. Results posted on the web. Also accepting unwanted exempt quantity, NORM and TENORM...
