Similar to the type E but using a large end window halogen quenched G-M tube. It is approximately twice as sensitive as the type E but has a lower scale limit and is recommended for measuring the lower contamination limits of soft beta emitters. The window is protected by a stainless steel grille and removable plastic cap.
| Window area |
15.5cm2 |
| Window thickness |
1.5-2.0mg cm-2mica |
| Beta sensitivity |
1.3 counts s-1for 1Bq cm-2 14C
4.0 counts s-1for 1Bq cm-2 90Sr/90Y |
| Alpha sensitivity |
0.9 counts s-1for 1Bq cm-2 238Pu |
| Gamma sensitivity |
5.0 counts s-1for 1uSv h-1(0.1mR/h)137Cs
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