Convert mR readings to uCi values: The "Specific Exposure Rate Constant", sometimes known as the "Gamma Factor", is the exposure rate at a specific distance...
Most ion-chamber instruments are open to the air, and are high range. Another class of instrument uses pressurized chambers and is much more sensitive. All...
www.etsu.edu/ospa/rso/sessions/Three.ppt The above link explains how the distance Betas travel in air is about 12 feet per MeV of energy. There are some good...
2.54 cm = 1 inch. 30.4 cm = 1 foot. 2.83E4 cc = 1cubic foot. The atom is the smallest part of an element that can be separated by chemical reaction. Atomic...
Have you been looking for a really good ( and cheap) lab vacuum pump for your cloud chamber or other project? Try borrowing you wife's FOODSAVER food vacuum...
GM probes, like the ones on CDV-700's, all the different end-window and pancake probes work on the same principle, in which a radiation penetration causes a...
Alpha and Beta particles are actually physical particles of matter. The Alpha is two protons and two neutrons, and consequently is relatively very heavy and...
A GM tube works by having a gas inside ionize when it is penetrated by radiation*. The gas is usually Helium, Argon or some other gas. If that one gas were all...
Using here the CS-137 @ 5 uCi, which gives off some Betas but primarily a 661.6keV Gamma. A homemade aluminum capsule filters the Beta, and yields a pure Gamma...
In the booklet that comes with the CDV 700's, they mention the check source as being Radium D+E. All that means is that it contains the 4th (D) and 5th(E)...
Or: "What next after the CDV700 with 6993 GM Tube?" By far the most common radioactive materials are the ones found in the soil and rocks in most every state...
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...
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