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@@ -7,11 +7,25 @@ You need a **geiger counter** board to run this application. This board can be u
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You also need jumper wires to connect the board on the **Flipper Zero**.
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-**Note :** this board uses a **J305** geiger tube. According this [website](https://www.rhelectronics.store/j305-glassy-geiger-muller-tube-nuclear-radiation-sensor) gamma conversion factor is **0.0081** for this tube. This value has been declared in the header of the source file so you can change it easily if needed. Incorrect conversion factor will give false measurements when **μSv/h** / **mSv/y** is selected.
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+**Note 1 :** this board uses a **J305** geiger tube. According this [website](https://www.rhelectronics.store/j305-glassy-geiger-muller-tube-nuclear-radiation-sensor) gamma conversion factor is **0.0081** for this tube. This value has been declared in the header of the source file so you can change it easily if needed. Incorrect conversion factor will give false measurements when **μSv/h** / **mSv/y** is selected.
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+
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+**Note 2 :** **J305** geiger tube is sensible only to **beta** and **gamma** rays. **Alpha** rays cannot be detected.
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+
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+Usable radioactive source :
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+- natural uranium (alpha, beta, gamma)
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+- natural thorium (alpha, beta, gamma)
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+- radium-226 (alpha, beta, gamma)
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+- cobalt-60 (beta, gamma)
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+
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+**Unusable** radioactive source :
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+- americium-241 (alpha)
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+- polonium-210 (alpha)
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+- tritium (very low beta)
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+- metallic/depleted uranium (alpha)
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The geiger counter board can be powered with +5V power pin of the **Flipper Zero**. This pin will automatically be enabled when the program is launched.
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-Output pin for measure on arduino cannot be used on the **Flipper Zero** because output voltage is too low. You can use jack out port instead. Just cut audio jack cable and connect audio channel (left, right or both together) with a cut male jumper wire on **A7** GPIO :
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+Output pin for measure on arduino cannot be used on the **Flipper Zero** because output voltage is too low. You can use jack out port instead. Just cut audio jack cable and connect audio channel (left, right or both together) with a cut half male jumper wire to **A7** GPIO :
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<p align="center"><img src="https://github.com/nmrr/flipperzero-geigercounter/blob/main/img/jack.png" width=40% height=40%></p>
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@@ -83,7 +97,7 @@ All previous measures in a row (the scale of the graph is automatically adjusted
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* 2023-01-09
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* Code fix
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- * Schematic was added
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+ * Global schema was added
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* 2023-01-08
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* Initial release
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nmrr