Update README.md

Tube specs
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# Geiger-interface
### J3x5 Tube specification
| Property | J3x5 |
|--------------------------------------------|--------------------------------------|
| Radiation type | beta, gamma |
| Dimensions (max), mm | d11 x 107 |
| Country of Origin | China |
| Vendors calibration<br>radioactive source | Co-60 |
| Sensitivity | 44 CPS at 1 mR/h<br>Co-60 |
| Dead Time | TBD |
| At the background level | 25 pulses/minute |
| Internal background <br>noise | 0,2 pulses/s<br>12 pulses/minute |
| Recommended operating<br>supply voltage | glass tube 380 V<br>metal tube 400 V |