Spec of J408 (CTC-8 )Counting tube:

Outer Dim.                                    23mm

Total length                                   220mm

Material of outer case                           Glass

1.Counting rate voltage                           285-340V

2.Recommendation work voltage                   400V

3.Smallest plateau                               80V 

4.Largest background counting rate                 80times/min.

5.Smallest plateau slope                          10%

6.Biggest initial voltage                           350V

7. γSensibility                                   380(60Co)(cps/uR/s)

8. Detecting object                               γ

Conditions of usage:

1.Load resistance                               5-10 megohm

2.Largest input circuit distributed capcity 

of counting instrument                         10 mmf.(mircomicrofarad)

3.Input capacity range of counting instrument       5-10 mmf.

4.Mobility range of environment temperature       -40--+50 C

Geiger Muller counter/GM counter j408/GM J408/Geiger Muller tube