LB 6701 Ionisation Chamber

The LB 6701-H10 is an Ionisation chamber used for dose rate measurements in various radiation protection applications. The measured quantity is ambient dose equivalent H*(10) and ambient dose rate equivalent



Ionisation chamber is made from Aluminium, with a Nitrogen gas filling and a radiation resistance up to 106 Gy.  

The ionisation chamber exists in 3 versions:

  • LB 6701L-H10 Low dose rate 10 µSv/h to 10 Sv/h
  • LB 6701M-H10 Middle dose rate 0.1 mSv/h to 100 Sv/h 
  • LB 6701H-H10 High dose rate 1 mSv/h to 1000 Sv/h

Depending on the version of the Ionisation Chamber the Nitrogen gas filling varies in the inside of the chamber: 10 bar for LB 6701L-H10 & LB 6701M-H10 and 1 bar for
LB 6701H-H10.

The chamber current is propotional to the dose rate, this current is converted into a +11 V Norm pulse frequency in the Current/Frequency converter LB 3856-24 (LB 6701L-H10) or LB 3856-23 (LB 6701M-H10 & LB 6701H-H10).

The Current/Frequency converter is mounted in a separate housing LB 6703 which also contains the High Voltage module to operate the Ionisation Chamber.

A 90Sr check source is built in the Ionisation Chamber to continuously monitor the proper functioning of the system. The activity of the source is depending on the version of the Ionisation Chamber: 2.5 kBq for LB 6701L-H10, 25 kBq for LB 6701M-H10 and 50 kBq for LB 6701H-H10.



Ionisation Chamber

Measuring range



LB 6701L-H10

LB 6701M-H10

LB 6701H-H10

10 µSv/h - 10 Sv/h

0.1 mSv/h - 100 Sv/h

1 mSv/h - 1000 Sv/h

Energy range45 keV - 1.3 MeV

Calibration factor



LB 6701L-H10

LB 6701M-H10

B 6701H-H10

0.1 mSv/h per cps

1 mSv/h per cps

10 mSv/h per cps

High Voltage                    1000 V





Operating Conditions
Ambient temperature0 °C to +50 °C                     
Relative humidity20 to 80 % condensing
Storage temperaturemax. 60 °C


General Data
Ionisation Chamber80 mm Ø x 268 mm                             
I-F-Converter Connection box240 mm x 160 mm x 90 mm
Protection degreeIP 65 (according to DIN IEC 60529)



Dose rate probe for photon radiation in Health Physics applications.

Product Information
Format Size
LB 6701H-H10 en PDF 231.56 KB
LB 6701L-H10 en PDF 231.62 KB
LB 6701M-H10 en PDF 231.59 KB