X射线正比计数器是一种气体型的X射线探测器件，它工作在气体放电正比区，有气体放大现象，因而信噪比高。和闪烁探测器相比，能量分辨率好，允许在较高计数率下工作，对低能X射线有较高的探测效率，是探测低能X射线和γ射线的能量和强度的良好探测器。
| type | Maximum length (inches/millimeters) | Maximum diameter (inches/millimeters) | Recommended working voltage (volts) |
|---|---|---|---|
| 431 | 2.94/74.7 | 2.11/53.6 | 1000/1350 |
| 433 | 2.5/63.4 | 1.49/37.7 | 1250 |
| 4312 | 2.94/74.7 | 2.11/53.6 | 1650 |
| 4313 | 2.94/74.7 | 2.11/53.6 | 1000/1350 |
| 4314 | 3.86/98.0 | 3.0/76.2 | 1000/1350 |
| 4315 | 2.94/74.7 | 2.11/53.6 | 1000/1550 |
| 4333 | 2.5/63.4 | 1.49/37.7 | 400/650 |
| 4335 | 2.5/63.4 | 1.49/37.7 | 1250 |
| 49550 | 3.55/90.1 | 3.0/76.2 | 1000/1450 |
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