NUCLEONIX SYSTEMS RC 705E Instruction Manual page 46

mersham QSA
40 North Avenue
Burlington Massachusetts
Source exposure conditions :
In calibration device model 773, serial number 397
The gamma-ray emission of the sealed source herein described was measured with a Radcal Corporation model
20X5-180 Ion Chamber whose relative response to cobalt
National Institute of Standards and Testing, approved calibration laboratory. Sensitivity of the Ion chamber is monitored
by reference to a NIST-Traceable cobalt60 source. Readings were corrected for atmospheric temperature and pressure
and for ambient air scattering and absorption. The source was measured with its axis of symmetry perpendicular to
the line joining source and chamber center. The reported output represents the intensity expected in the absence of air
and surrounding objects. It is believed to be accurate within +/- 7%, made up of the stated +/-5% uncertainty of the NIST
source calibration and the +/-2% estimated precision of
GAMMA RAY SOURCE CALIBRATION
Isotope
Half Life
137
Cesium
30.2years
Source
Identification
Date Measured
05-AUG-2002 S-1028
CH P T A ERI – IX I
Rhm/Ci
0.32
MilliRoentgens/hr
at 1 meter
51.7
60 , cesium 137 , and 50 kvp X-rays had been determined by a
VT
comparison.
Signed___________________________
Standards
Laboratory
Report
Test No.
5923
MilliCuries
161.5
DATE
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