Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Summary of Contents for Images SI DTG-01
-
Page 2: Table Of Contents
Contents 1. Introduction ........... . . 3 Features . -
Page 3: Introduction
1. Introduction The model DTG-01, Desktop Geiger Counter has an external wand that houses the Geiger Mueller tube. Scientific Instrument & Industrial Tool Our Digital Geiger counters have been calibrated and certified accurate in reading radiation levels to with- in 5% from background radiation to 1000 mR/hr. NRC Certification available at additional cost. - Page 4 Random Number Generator function outputs a r ange of r andom number s for ever y r adioactive particle detected. Included 9V wall transformer power s the DTG-01 by connecting to the back of the unit by way of a 2.1/5.5mm jack and socket.
-
Page 5: Main Panel Controls
1-2. When the switch is in the down position, the random number generator will out put numbers in the range of 1-128. More information on using the random number generator function can be found on page 8. DTG-01... -
Page 6: Usb/Ttl Adapter
Serial data consisting of the CPS counts may be read by a Windows PC computer using a USB/TTL Serial Cable, included. USB TTL Serial Ca- ble allow easy interfacing of the DTG-01 via USB. The cable has a USB connector on one end that plugs into PC, and a 3.5mm stereo jack that plugs into the DTG-01. -
Page 7: Operation
Metric or Imperial measurement. Next set the time function switch to CPM. The LCD display changes. The left side of the first line begins a count up to 60 seconds, increasing by 1 each second. The right hand side of the first line displays the number of radioactive particles detected. DTG-01... -
Page 8: Random Number Generator
“Initializing” for the first 60 seconds. R andom Num be r G ene rato r The DTG-01 has a built in Random Number Generator (RNG). A three position switch controls the RNG. In it’s center position the RNG is off, and the DTG-01 operaties in Geiger Counter Mode. -
Page 9: Graphing Software
These drivers may also be downloaded from the Images website at: http://www.imagesco.com/semiconductors/usb-3.5mm.html Once the drivers are installed, restart your computer and then plug the cable into an available USB port. Now install the Windows Geiger counter program on your computer. The digital Geiger counter has TTL DTG-01... - Page 10 Others frame. This compr ises of a Pr int Char t button which allows to pr ints the cur r ent plot, a Settings button which opens the Settings dialog, an About button which displays the infor- mation about the program, and an Exit button which quits the program. Images SI, Inc.
- Page 11 High byte is followed by the low byte. Communication parameters are: 9600 Baud, Inverted, 8 da- ta bits, no parity and one stop bit. These parameters are for anyone wishing to read the data from the Digi- tal Geiger counter. DTG-01...
-
Page 12: Geiger Counter And Radiation Basics
(anode). It is constructed with a thin Mica window on the front end. The thin mica window allows the passage and detection of alpha particles. The tube is evacuated and filled with Neon, Argon plus Halogen gas. Images SI, Inc. -
Page 13: Count Rate Vs Dose Rate
C oun t Ra te vs Dos e R a te Each output pulse from the GM tube is a count. The counts per second give an approximation of the strength of the radiation field. Below is the GM tube used in the DTG-01’s response to a cesium-137 source. -
Page 14: Measurement Of Radiation
1 Sv = 100 rem 1 rem = .01 Sv 1 mSv = 100 mR (mrem) 1 mR = .01 mSv 1 Gy = 100 rad 1 rad = .01 Gy 1mGy = 100 mrad 1 mrad = .01 mGy Images SI, Inc. -
Page 15: How Much Radiation Is Safe
Because of the randomness of radioactivity, background radiation can vary from minute to minute and place to place. In my corner of the world I have a background radiation that triggers the counter 22-34 times a minute. DTG-01... -
Page 16: Checking For Radiation
To obtain your normal background radiation reading take an hour's worth (60) of one minute readings. This is the CPM (counts per minute) mode on the DTG-01. With this data collected. I would add the 60 readings together. I would then take that total and divide it by 60 to get an average CPM reading. Next I would look through the 60 CPM readings and mark down the highest count CPM reading, and the lowest count CPM reading. -
Page 17: Finding Radioactive Sources
If we place a thin metal shield in front of the GM tube that would effectively block the alpha and beta radiation, allowing the detection of only gamma radiation. Radiation Shields for wand are available here: http://www.imagesco.com/geiger/shields.html DTG-01... -
Page 18: Nist Calibration / Nrc Certification And Why It's Important
NRC, can I return the Geiger counter for a refund?" Their answer will tell you what you need to know to make a sound purchasing decision. Images SI, Inc. entire line of Digital Geiger counters are capable of receiving an NRC certification. This certification is available to our customers at an additional cost. -
Page 19: Generation Of Random Numbers
Generation of Random Numbers The DTG-01 relies on the immutable randomness of background radioactivity to generate random numbers. Quantum mechanics states that the nuclear decay of atoms, are fundamentally random and cannot be pre- dicted. The detection of a background radioactive particle is a random event trigger for the Random Number be- cause it is impossible to predict with any accuracy the exact moment a radioactive particle will be detected. -
Page 20: Appendix
Detector Sensitivity Beta above 50 KeV Gamma above 7 KeV Countable Pulse Resolution 1 Count Per Minute (CPM) - 5000 Counts Per Second (CPS) Range 1.0uR/hr - 1000 mR/hr Radiation Resolution & Range .01uSv/hr - 10 mSv/hr Images SI, Inc. - Page 21 DTG-01...
- Page 22 Registration must occur within 30 days of delivery. Images SI, Inc. will, at its own discretion, repair or replace the Geiger counter if it fails to operate properly within the warranty period provided that it has not been subjected to misuse, abuse, or neglect. Modification or repair by anyone other than Images SI, Inc.