True, most of us in this "hobby" want low range, high sensitivity detectors and systems. We have easily reached the maximum sensitivity allowed by nature and ...
Taking a Radiation Reading" is a simple matter. Understanding that reading may be a little more complex. Yes you can point your CDV700 at something, and get a...
Electrical Tape Tips by K0FF Did you ever notice that electrical tape, like a hammer, comes with no instructions? Perhaps the makers figure that everyone ...
One MicroCurie of activity is equal to 2.22 X 10 E6 DPM ( disintegrations per minute). or: 2.22 X 10E6= 2,220,000 DPM and DPM = CPM ( Measured on meter ) X...
Backscatter is nothing more than a reflection. When Beta particles strike an object they are either absorbed, pass through or bounce back. The Radium D+E or Pb...
... This was a very good question, and the easy answer is that each TYPE of tube has a rating in terms of CPM it will give per 1 mR/H of a certain isotope. ...
When I asked Mat Hazard to come over and check out some LEGs, he was eager to help. When he got here he said "where are the girls?". LEG = Low Energy Gamma...
note, photos not currently available on this board. Here's the setup: Cs-137 is the source, which has well separated Gammas, one at 32 keV the other at 661 per...
NIM means Nuclear Instrument Module Long ago a standard was agreed upon to allow different manufacturer's to make modules that would fit into a nuclear...
Welcome to the group! ... We subscribe here to the definition as stated in the Electronics and Nucleonics Dictionary (Markus/Margraw Hill): " Roentgen- the...
Geologists have a keen interest in radioactivity, as it can foretell the nature of the earth in the vicinity. Some even use the small differences to detect the...
SI Units for Radioactivity The SI unit is the becquerel (Bq) 1 Bq = 1 disintegration per second = 2.7 x 10-11 curie (Ci) 1 Ci = 3.7 x 1010 Bq = 37 GBq Other...
The Ludlum 44-6 and Eberline HP-270 (Note1) have almost the exact same sensitivity with the shield open. Inside they use the same tube, a 725 from LND. This...
The 715,717 and 720 run at 50 Volts. As you know the CDV 700 runs at 900 Volts. No interchangeable parts between the Ion-chamber and true Geiger Counter...
X-Ray Fluorescence in Lead We know that lead is dense and is often used for radiation shielding. It would make sense that a thicker piece of lead would shield...
Measuring the energies of a Beta emitter by the subtractive process using absorbers is pretty straightforward. Betas are not of one energy like Gammas, but...
We have learned some facts about radiation, it's types and what energy level means. If not, you can brush up in the archives, the PRIMER. All GM tubes put out...
For general radiation detection and measurement, Knoll's " Radiation Detection and Measurement", published by John Wiley and Sons is a must read. Moe's...
Re-read http://groups.yahoo.com/group/GeigerCounterEnthusiasts/message/1779 to refresh the memory on QF Quality Factor. Briefly, each different isotope has a...
The new digital scale arrived the other day and I must say it does compliment the Home Lab. I chose the OHAUS CS-200 for my purchase, it has a large deck to...
Whining in the earphone, CDV-700 by ENi, often a problem. Several causes have been located and documented ( bad electrolytic filter, bad transistors, bad...
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...
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...
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...
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...
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...
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 ...
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