Nuclear radiation detector- spectrometer for Android and iOS
1. Turn on "flight" mode into your phone
2. Insert the nano dosimeter tightly
3. The "headset" icon will appear (not on all phones)
4. Open the app (make set up the first time you start)
5. If you need a check, put the container with a control source tightly on the dosimeter and make a control measurement (3 minutes)
In Play Market and the App Store, you'll get a "Geiger" or "Dosimeter" and choose what's best for you. Atom Spectra and Geiger Bot are designed for spectrometry. The most popular "Smart Geiger EX." The app is set up automatically the first time you start, and you can immediately start measuring and searching for radioactive items.
Set up Smart Geiger EX app:
The application shows a natural background of 10 μR/h (0.10 µSv/h), i.e., under normal conditions on the screen it will be shown "0.10", which occasionally will increase when particles hit directly into the nano nuclear radiation detector.
If the particle falls not into the dosimeter and next to it (say in the phone), the dosimeter will see it, because when the particles collide with substance atom collides with the atom, they knock out the electrons from its lower levels and when the remaining electrons go down (closer to the nucleus) then they emit photons with energy up to 100 keV (so-called "X-ray fluorescence").
These photons are recorded by the dosimeter, but with little energy they create weak impulses that the Smart Geiger EX program ignores (believing it is noise). Theaccuracy of the background measurement does not suffer from this, but the time ofmeasurement increases (a few minutes). If you measure a radioactive object, saycontaining radium, the particles energy will be there >100 keV and Smart Geiger EXwill detect and measure it quickly (in 30 seconds). You can visually control thesituation on the color of the scale: green - the norm, yellow - excess, red -dangerous. If the Smart Geiger EX program doesn't work correctly, go to thesettings (circle in the top right corner) and start auto-calibration.
Smart Geiger EX is the most popular and usable app in 90% of cases, but if youwant the exact value of the natural background, or the graph of its changes, or theoverlay of the background on the map, or spectrums, then you need to use morecomplex programs such as: AtomSimple, PocketGeiger, RadMeter, AtomSpectra,Geiger Bot or paid applications.
Set up Atom Simple app:
In the settings (at the very bottom) - choose the option "for developers" - find threepoints in the top right corner and click - choose "additional settings" - to change thevalues:
1. Put all settings in zero (except "K," "t," "MD")
2. "t" put 1000
3. "MD" pick so that from the background there was about 1 pulse in 10-30s
4. The "K" option is to set the exact background value
Set up Rad Meter app:
The Rad Meter program has the ability to set its own sensor (Custom Sensor),which allows you to fine-tune, but you can first choose the type of "BPW34x2"sensor.
Set up Pocket Geiger 1.02 app:
You need to go to the settings (sometimes you need to press the appropriate controlbutton on the phone at the bottom).
In the settings put "Threshold Radiation" so that the natural background would be about one pulse in 10-30 s.
Set "Noise Threshold" at "0.0%."
"Reverse Input" depends on the phone, install it so that a blue line (above the redline of signal) on the tab "Input Wave" would be cross a sharp narrow half-wave ofmomentum, and a sloping wide half-wave (going behind it) – would be at the bottom.
The most complex but useful feature of this device is spectrometry.
Spectrum is a graph that horizontally has the energy of particles, and vertically - the number of registered particles with a specific energy. Thus, you can see which particles hit the dosimeter.
Spectrums can identify isotopes, and help identify weak pollution in food, soil, building materials, etc.
To get spectrums install Atom Spectra or Geiger Bot.
St up Atom Spectra 1.04 app:
You need to go into the settings and remove all the "ticks."
"Reduced to:" set 1024.
The main thing is the noise threshold "Noise discriminator", it can have any value (usually from 500 to 3000, depends on the model of the smartphone). You need to find a value where in the top left corner of the screen the option "sps:" will be predominantly "0" (several times per minute "1"), and on the graph several times per minute will appear /grow the line on the left (this is a natural background).
When properly adjusted, the natural background will give about one pulse in 10-30s and look like the lines on the left of the screen, in a low energy area (since the natural background, as mentioned earlier - is predominantly X-ray fluorescence, with the energy of photons <100 keV). If there is a source of radiation, there will be lines to the right of the background, which will line up in the shape of the isotope accordingly.
If "Noise Discriminator" is less than 400 means a squelch is turned on the phone and it is desirable to turn it off.
If this parameter is less than 250 - then the squelch does not work correctly and it must be turned off, otherwise the spectrums will be very compressed and low-informative (how to turn it off read on the Internet about your phone).
If the "Invert Input" is turned on, the spectrum is wider (longer horizontally) , then you need to leave it turned on.
If you touch the screen, then on the spectrum green line appears- it allows you to set the range of the horizontal scale. To do this, click the desired arrow in the top right corner and set the value.
If you touch the screen and hold, the color of the graphics will change (white/blue).
All other Atom Spectra settings not specified in this recommendation can be changed at your discretion.
Important! If the Atom Spectra version is more than 1.04, there may be differences! But in any case, "Noise Discriminator" is the basis.
Geiger Bot is an iOS spectrometer, the setting is complex and goes beyond this description.
Weak pollution identification:
As mentioned above: the spectrum is a graph, which horizontally - the energy of particles, and vertically - the number of registered particles with a specific energy.
The spectrum allows you to see which particles got into the dosimeter, and this can be used to detect weak contaminants (comparing the spectrums of the sample with the background spectrum at the measurement point).
To do this, pre-measure the background with Atom Spectra program , 30 minutes (the longer the better). If then, without changing the position of the dosimeter, attach to its top of the sample (grunt, water, building materials or food) and make a measurement of the same duration, then in the presence of even weak pollution - it will appear in the form of lines that were not on the spectrum of natural background.
This is a very valuable function of the Nano dosimeter, because in everyday and camping conditions, there is virtually nothing to do such an analysis!
Determining the presence of radon in the air:
If you put the tablets of activated charcoal in different places of the studying area, say, for a day (the longer the better), the coal will accumulate radon, and the products of its decay can be registered by any good dosimeter or spectrometer - for example, this nano dosimeter.
It is important to apply the tablet tightly to the top of the dosimeter. You can measure any program - if there is a clear difference with the tablet and without, then there is a radon!
If the result is negative, you can make a more sensitive measurement - using a vacuum cleaner (the technique is seen on the Internet).
This nano dosimeter works with Arduino.
Electric power that should be supplied to connection nearest to the hull (the rest is the earthing) through the resistor (about 10 kOm).
Signal to read from the point of power (voltage there is about 1.5V).
You can power supply directly from the port of ADC (through the pull-up resistor of the port), but then the power of MK is desirable to be 5V.
Working nano dosimeter with computer (Windows):
It connects to the microphone entrance.
If the PC is old or stationary (separately 3 pin - microphone and 3 pins - earplugs), you need a cable/adapter from 4 pins to 3 pins.
In the microphone settings, it is important to turn on the amplifier (otherwise it does not work).
Programs to use: "PRA" "Becquerel Monitor," "Theremino"
The nano dosimeter works with iOS.
For iPhone, iPod, etc. it's the same as for Androids in the "Smart Geiger EX" part. The rest of the program is different ("Geiger Bot" instead of "Atom Spectra").
Dosimeter check (control source)
You can check the work of the dosimeter by taking container in which it was delivered on the dosimeter (tightly up to the point).
In the container there is a bead made of uranium glass with a very weak background (most dosimeters do not see it), it creates a minimum number of pulses, but enough to test. Typically, "Smart Geiger EX" shows the level in the yellow zone several times for 3 minutes (beads have different radioactivity, so the numbers may differ from those in the photo).