CV2138 geiger muller tube
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This tube measures 70x36mm overall. |
This tube is marked No. 8938, Volts 1410, Window weight 7MGm/cm2. Equivalent to GM4 this uses ethyl formate as a quenching agent which gives better plateau characteristics and temperature coefficients.
| Plateau length average | 250V |
| Plateau slope average | 0.05% |
| Operating voltage limits | 1250 to 1450V |
| Count life | 6x10^8 |
| Shileded background counts | 7 to 15 per minute |
| Signal output | 220/100+C (*) |
| Dead time | 100µs |
| Recovery time | 250µs |
*: C = the total capacitance across the tube in pF
