# Geiger-interface

### J3x5 Tube specification
| Property                                   | J3x5                                 |
|--------------------------------------------|--------------------------------------|
| Radiation type                             | beta, gamma                          |
| Dimensions (max), mm                       | d11 x 107                            |
| Country of Origin                          | China                                |
| Vendor’s 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 |