Neutron dose rate ,fluence rate and cps conversion

1. Oct 27, 2013

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Dear Forum :

We use Thermo BIOREM 751 to measure the neutron dose rate in the lab.
I would like to know how fleunce rate and cps converse to dose rate.
There is technical data in the manual, but I still do not understand.

For example, considering the neutron fluence rate 1000/cm^2 sec with energy 2MeV
(Primary energy of reference nuclide 252Cf)
,the dose rate is 0.18 Sv/h.
http://ppt.cc/Kc3v

According to the calibration factor,it converses to 10,000 cps.
The fluence rate 1000 /cm^2 and 10,000 cps dose not match because the active surface of the detector is not 10 cm^2.
http://ppt.cc/1ldT

Also,if the neutron energy is below MeV, the dose rate overestimates significantly.

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