M
M
e
e
a
a
s
s
u
u
r
r
e
e
m
m
e
e
n
n
t
t
S
S
p
p
e
e
c
c
i
i
f
f
i
i
c
c
a
a
t
t
i
i
o
o
n
n
s
s
Precision
Precision is defined as ±one (1) standard deviation in density
readings. This number is calculated by the ratio of the standard
deviation in the counting rate and the slope of the calibration
curve at a given density.
Parameters at 6-inch depth
Direct Transmission Mode
150 mm (6 inch)
Measurement time is 2 min; Background Time is 1 min
kg/m
3
lb/ft
3
Density 2150 135
Precision ± 4 ± 0.25
Composition error ± 0 ± 0