
Applications of Tagged Neutron Beams
382
Relation between mass and volume percentage is given by the following
equation:
%
()
mass
mass
mass
mass
V
carbon
carbon sand
carbon
carbon
=
=
⎛
⎝
⎜
⎞
⎠
⎟
+
VV
mass
V
V
carbon
carbon sand
carbon sand
carbon s
⎡
⎣
⎢
⎤
⎦
⎥
⎛
⎝
⎜
⎜
⎞
⎠
⎟
⎟
+
+
+
aand
carbon
vol
⎡
⎣
⎢
⎢
⎤
⎦
⎥
⎥
=
%.
ρ
ρ
Detection limit of carbon for the experimental setup was 4% vol. or 1.6% mass.
is is illustrated in Figure 7.126 where it can be seen that gamma ray spectra
of sample No. 1 (containing 3.85% vol. of carbon) and pure quartz sand can-
not be well distinguished. Figure 7.127 shows gamma ray spectrum of the
soil taken inside the campus of the Ruder Boskovic Institute. e obtained
concentr ...