Sample Calculation - GE RSDetection RS-S131-200-ER0000 User Manual

RSDetection
User's Manual
6.4.1

Sample Calculation

1. Calculate the Exposure Rate at a distance "D" from Co
source certification:
= 1062uR/h
E
12
E
12
1. Sensitivity of the sensor at distance "D" from Co
D EXPOSURE
Feet cm R/h
12 365.8 202.8e-6
K = [(P+S+A) – (S+A)] / Exposure Rate
k = -6.124e-12 – -1.403e-12 ] / 202.8e-6 R/h
[
k = -2.328e-8 amps/R/h
2. Calculate the average sensitivity. In a typical calibration, the following values of k
might be calculated:
Feet
12
14
16
18
3. Calculate the standard deviation σ = 3.6e-11.
March 2016
Page 56
D = 12 feet(365.8 cm)
t = 3.37years( 1230.8days
T = 5.26years( 1920days)
= 1062 uR/h
E
100
2
 
100

 
(D - 100)
= * *
E E e
12 100
 
D
2
 
100
 
- 6.8E - 5(265.8)
*
e
 
365.8
= 1062uR/h * 0.07475 * 0.982
= 49.1uR/h
E
12
P+S+A
RATE
amps
-6.124e-12
D
cm
366
427
488
549
source 't" years after
60
)
*
K
d
- 0.693(3.51 /5.26)
*
e
* 0.63
source:
60
S+A P
amps amps
-1.403e-12 -4.722e-12
amps/R/h
-2.328e-8
-2.335e-8
-2.336e-8
-2.333e-8
-2.333e-8
Average( k )
g
k(Co60)
amps/R/h
-2.328e-8
k
S131-200-UM Rev A