Thermo Scientific RadEye B20 Operating Instructions Manual page 60

The RadEye B20 and B20-ER is factory calibrated to the ambient
dose equivalent rate H*(10) in a depth 10 mm for Cs-137 gamma
radiation (662 keV).
Without any energy filter, the displayed dose rate is a good meas-
ure of the ambient dose equivalent rate H*(10) above 150 keV.
From 20 keV to 150 keV the dose rate is overestimated.
Furthermore the displayed dose rate is a good approximation for
the directional dose equivalent rate H'(0,07) in a depth 0.07 mm
for beta radiation and for gamma radiation in the range from 5
keV to 12 keV.
By use of the gamma energy filter 425068582 a very flat response
in terms of the ambient dose equivalent rate H*(10) "deep dose"
in a depth 10 mm is achieved for gamma energies 17 keV to 1.3
MeV.
For details of the response curves see technical data section.
5-4 DB-065 E RadEye B20/-ER
Iw/Tr/Ff 06.03.2017