The ionizing radiation detector GGreg20_V3 - a ready-to-use new generation device with Geiger tube SBM-20 and pulse counting output.Designed by iotdevices in Ukraine
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Purpose Radioactive particles detector - an electronic sensor module for building a personal ionizing radiation level counter. For this purpose, the detector includes an impulse counting output to ...Read More…
Radioactive particles detector - an electronic sensor module for building a personal ionizing radiation level counter. For this purpose, the detector includes an impulse counting output to a host controller. Arduino, Adafruit, ESP8266, ESP32, and others can be used as a host controller.
The radiation level is displayed by light and sound signals. Sounds can be muted by the user (jumper J1 - buzzer on/off).
GGreg20_V3 - a cheap and useful device for checking the "purity" of:
This module is useful to build smart measurement devices for ionizing radiation power sensing in handheld/pocket design style or in stationary mode both for indoor or outdoor operation. The only thing you need to start measuring the power of ionizing radiation with any GGreg20 module is any microcontroller that can count the number of pulses per unit of time on GPIO.
Power supply of the SBM-20 tube - built-in adjustable high voltage DC-DC converter. The target 400V voltage level is regulated by a potentiometer. The module is sold with fine-tuned parameters and ready for use.
Dimensions and Pin assignments
GGreg20_V3 module pin assignments are as follows: - BAT - Power supply input 2.2V - 5.5 V; - ON/OFF - Main switch on/off; - OUT - Pulse output, active-low; - BUZ - Buzzer enable jumper.
Sizes and dimensions of GGreg20_V3 module are as follows: - X: 126 mm; - Y: 30 mm; - Z: 12 mm.
Differences and compatibility with the previous versions of GGreg20
|Names of characteristics||GGreg20_V3 (NEW)||GGreg20_V1||Improvement status|
|Stability of detection results||In the range of 2.4 - 5.5 volts (see note 2)||Only at a supply voltage of 5 volts (uUSB input)||Improved|
|Power supply voltage range||2.2 - 5.5 volts (see note 2)||3.7 - 5.5 volts||Improved|
|Autonomous power supply||1 cell Li (3.7V) or 2 cell Ni (2.4V) or battery 3V or AC / DC adapter 2.4 - 5.5 V (see note 2)||1 cell Li (3,7V) or 3 cell Ni (3,6V) or 3 cell battery (4,5V) or AC/DC (5V) adapter||Improved|
|The integration in devices||Two connectors and one jumper (total 6 pin)||Three connectors and a jumper (11 pin in total)||Simplified|
|Protection against connection errors||Key connectors used and Schottky diode installed (see note 2)||Not provided||Improved|
|The design and size||Same, except placing the power switch||-||mostly unchanged|
|Current consumption||near 30 мА||near 30 мА||no change|
|Calculation formula||-||-||no change|
|Measurement accuracy||20%||20%||no change|
|User interfaces||LED, buzzer, Output connector||LED, buzzer, Output connector||no change|
Note 1 GGreg20_V2 module version was not included in comparison because it was designed for other design solutions (and it does not provide space for SBM-20 tube on plate placement).
Note 2 By default, the module board has a protection diode against false reversal when connecting the battery. This narrows the voltage range of the input power supply: 3 - 5.5 volts.
Switching-on and measurements
Connect the power input from the selected power source.
Turn on the power supply and in 10-15 seconds, you will hear the sound and see light signals when active particles enter the tube.
With a normal background level of radiation, the tube registers and generates 20-30 pulses per minute. The number of pulses can fluctuate depending on the weather or cosmic radiation. Consider the average number of signals per minute.
If you receive more than 60 signals per minute, be careful. Your detector has "felt" the effects of ionizing radiation emissions from the ambient environment or food, mushrooms, or wood, etc.
In short, the formula is simple: you need to accumulate the number of ingoing GPIO pulses per minute and then multiply by a factor. Like this:
microsieverts per hour = (impulses per minute) * 0.0092
where 0.0092 coefficient is obtained from the manufacturer’s documentation on the tube.
Tubes may vary (+-20%), so we recommend using a conversion factor from 0.0054 to 0.0092 and calibrate your calculations against a trusted (certified) device.
Product kit sets
Connectors (installed) and cables
Pulse output cable 15 cm with connectors --- 1 pc:
Power supply input cable 15 cm with JST XH 2P female connector on one side --- 1 pc.
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