3He正比计数管是中子探测器，是以3He气体为工作气体的正比计数管，一般为圆柱形管。它是基于3He(n, p)T核反应法的中子探测器，反应能为0.765MeV，热中子反应截面为（5333±7）b，中子能量在0.001eV~0.03eV范围内探测效率遵从1/v定律。它的主要优点是中子探测效率高，3He是惰性气体无负电性。我公司可根据用户需求，提供国内外各种型号规格的3He正比计数管。
| type | Maximum length (inches/millimeters) | Maximum diameter (inches/millimeters) | Recommended working voltage (volts) |
|---|---|---|---|
| 25267 | 24.4/620.3 | 1.0/25.4 | 750 |
| 25257 | 45.3/1150.6 | 1.0/25.4 | 1100 |
| 25241 | 24.4/620.3 | 1.0/25.4 | 1300 |
| 25229 | 16.75/425.5 | 1.0/25.4 | 1000 |
| 25228 | 45.3/1150.6 | 1.0/25.4 | 1000 |
| 25225 | 45.3/1150.6 | 1.0/25.4 | 1000 |
| 25020 | 43.31/1100 | 0.31/8.0 | ＜2000 |
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