Response Test With Test Adapter - Thermo Scientific RadEye G20-ER Operating Instructions Manual

6.4

Response test with test adapter

The test-adapter 42549/48 offers a convenient way to verify the
radiation response performance of the RadEye G20. This "check
source" contains 50 g of natural Lu2O3 (which corresponds to
approximately 2400 Bq Lu-176). Due to the low resulting gamma
dose rate this yields a net dose rate of the RadEye G20-10 of ap-
proximately 0.25 µSv/h. The operational advantage of the test-
adapter is given by the fact that each and every individual adapter
has the same emission rate, and that due to the long life time
(3.6E10 years), which exceeds the age of the universe signifi-
cantly, neither source specimen, nor half life corrections need to
be performed. Furthermore the specific radioactivity (approxi-
mately 48 Bq/g) of natural Lu2O3 is well below the threshold
values according to IATA, respectively NRC (USA) or
StrSchV(Germany) in respect to the scope of dangerous goods
definition and transport regulations of radioactive material.
At a typical background count rate < 0.1 µSv/h, it is sufficient to
verify the response within 300 seconds for a 10 % statistical un-
certainty.
For a faster response verification Ba-133 check sources (or other
gamma sources) in the range of 100 – 400 kBq are suggested.
6-4 DB-067 E RadEye G20
Iw/Tr/Ff 26.11.2012