Got my knee x-ray pictures today. So this is me and DRSB-1 radiation detector under x-ray. Nice view of SBM-20 geiger tube internal structure (click the photo for enlarged version)
RH Electronics https://rhelectronics.store
Monday, February 11, 2013
Sunday, February 3, 2013
Fiestaware (Uranium Oxide) hot sample testing with DIY Geiger Counter, about 11000 CPM!!
Testing Fiesta Ware (Uranium Oxide) Hot samples with SBM20 and DIY Geiger Counter and getting 11820 CPM! The samples was purchased from sciencefare (search him on eBay with query: "Geiger Counter Test Source"). He was kind enough to send them to me quickly and well packed.
Time to seriously think about where to get the lead sheets for all my samples. Rick (sciencefare) advised this store http://www.imagesco.com/geiger/lead-sheet.html but the shipping charges is high for outside USA. Any suggestions?
Friday, February 1, 2013
Website Update
Dear Customers,
The website was transferred today to new hosting. Please delete browser cash, cookies and flush DNS cash if you cannot access the site.
Start --> Run --> cmd --> ipconfig /flushdns
If this product is visible to you then DNS cache was successfully updated.
Thank you!
The website was transferred today to new hosting. Please delete browser cash, cookies and flush DNS cash if you cannot access the site.
Start --> Run --> cmd --> ipconfig /flushdns
If this product is visible to you then DNS cache was successfully updated.
Thank you!
Tuesday, January 22, 2013
Geiger Counter Dosimeter Nuclear Radiation Detector DIY Kit with Free Windows Logging Software released
The kit is released today. Now it available for purchase. I offer free shipping to Japan. For more technical details please visit product page:
The kit is supplied without Geiger Tube, TTL Module and without USB Cables. This items should be purchased separately. The PCB allow SBM-20 / STS-5 tube installation. Maybe J305B tube will also fit into the clips size, I still not received J305B tubes for test, but the PCB dimensions allow it regards J305 datasheet.
I also posted PIC16F628A source asm file, so if you are familiar with PIC's you can modify conversion factor, alert threshold or calibrate it for your tube. The dafault filmware will be OK for most users, but if you need some special values please contact me before you buy.
Windows software can be downloaded for free. It monitor CPM readings and plot graphs. "Radiation Logger" is COM Terminal program that was written for dosimeters with UART communication. Connection settings are configurable. It was tested with my kit, but you can use it with other similar devices.
The kit is supplied without Geiger Tube, TTL Module and without USB Cables. This items should be purchased separately. The PCB allow SBM-20 / STS-5 tube installation. Maybe J305B tube will also fit into the clips size, I still not received J305B tubes for test, but the PCB dimensions allow it regards J305 datasheet.
I also posted PIC16F628A source asm file, so if you are familiar with PIC's you can modify conversion factor, alert threshold or calibrate it for your tube. The dafault filmware will be OK for most users, but if you need some special values please contact me before you buy.
Windows software can be downloaded for free. It monitor CPM readings and plot graphs. "Radiation Logger" is COM Terminal program that was written for dosimeters with UART communication. Connection settings are configurable. It was tested with my kit, but you can use it with other similar devices.
Wednesday, January 16, 2013
Updates about new Geiger Counter Kit
Here is some updates about my new Geiger Counter kit. The pcb boards are ready and I'm going to test it soon. The boards are good quality thanks to my Chinese friend Qiumin!
My colleague Dima works on Windows application for the dosimeter. The PC software is still in beta-testing, but at this point I'm happy with the results. It's receive CPM readings from the dosimeter, calculate radiation dose with any conversion factor you need. It can write logs files and do some graphs. Probably we'll add alarm threshold too.
The dosimeter can communicate with PC through FTDI FT232, PL2303 or CP2102 virtual COM port USB IC's. Of course it will do through a native COM port also, but you'll need MAX232 TTL converter chip.
On the photo above I use FTDI module for communication with prototype.
I still cannot say when the DIY kit will be available for sale, because here is many work I need to complete. If you interested please follow my updates.
My colleague Dima works on Windows application for the dosimeter. The PC software is still in beta-testing, but at this point I'm happy with the results. It's receive CPM readings from the dosimeter, calculate radiation dose with any conversion factor you need. It can write logs files and do some graphs. Probably we'll add alarm threshold too.
The dosimeter can communicate with PC through FTDI FT232, PL2303 or CP2102 virtual COM port USB IC's. Of course it will do through a native COM port also, but you'll need MAX232 TTL converter chip.
On the photo above I use FTDI module for communication with prototype.
I still cannot say when the DIY kit will be available for sale, because here is many work I need to complete. If you interested please follow my updates.
Monday, December 10, 2012
Geiger Counter Prototype with PIC16F628A MCU
I wish to share some photos of my new prototype for Geiger Counter DIY project. It can be powered from 4x AA Ni-MH batteries, USB or USB-UART adapter. High Voltage circuit section stay same like in my previously Radiation Detector DIY Kit.
PIC16F628A microcontroller part count events from tube cathode. Then it calculate CPM (counts per minute) and radiation dose.
The program code can be changed and calibrated to any other Geiger tube type, just required to change conversion factor in source file.
Microcontroller send CPM readings via UART. It can be used with COM port or FTDI USB module for communication with PC.
DIY Kit for this project is expected to be produced soon. Please follow our updates!
PIC16F628A microcontroller part count events from tube cathode. Then it calculate CPM (counts per minute) and radiation dose.
How to convert CPM to radiation dose? (Thanks to cooking-hacks.com about all conversion information)
Let's check first the SBM20 datasheet. It tell that the tube has Gamma Sensitivity for Ra226 29 cps/mR/hr and for Co60 is 22cps/mR/hr. I used arithmetic average of 25.5 cps/mR/hr because I do not have radioactive calibration sources.
1. Convert cps to cpm:
25.5 x 60 = 1530 cpm/mR/hr
2. Divide to absorption constant to convert from mR to uSv:
1530 / 8.77 = 174.46 cmp/uSv/hr
3. Calculate the tube Conversion Factor:
1 cpm = 1 / 174.46 = 0.0057
4. Now you just need to multiply your CPM reading to Conversion Factor. The picture above shows 8.344 uSv/hr for 1464 cpm:
1464 x 0.0057 = 8.344
The program code can be changed and calibrated to any other Geiger tube type, just required to change conversion factor in source file.
Microcontroller send CPM readings via UART. It can be used with COM port or FTDI USB module for communication with PC.
DIY Kit for this project is expected to be produced soon. Please follow our updates!
Saturday, December 1, 2012
Radiation Detector DIY Kit with MCU
Is it possible to use Radiation Detector DIY Kit from www.radiohobbystore.com with MCU Project?
Definitely yes! You can connect the kit board to your MCU project. Configure the MCU to count high-low-high interrupts. Also remember about pull-up resistor from kit board to the MCU port.
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