ECOTEST MKS-05 TERRA Operating Manual page 50

Perform five measurements of DER. Register the received readings in the protocol, and
calculate the average value of DER and main relative error of measurement in percentage.
Place the holder and the dosimeter in the position, where DER from the
3
8·10 µSv/h.
Perform five measurements of DER. Register the received readings in the protocol, and
calculate the average value of DER and the main relative error of measurement in percentage.
The dosimeter is acknowledged to have passed the testing if the main relative error at
measurement of DER level does not exceed
the measured DER in µSv/h.
3.2.4.4 Calculation of main relative error at photon-ionizing radiation DE measurement
Prepare the dosimeter for photon-ionizing radiation DE measurement according to item
3.3.3.4 of the OM.
2
15 
, where
H 

( 10 )
49
137
Cs source is

is a numeric value of

H 10 ( )