
3.4 Well Logging Sealed-Tube Accelerators
55
Peak neutron
yield 2 × 10
8
n/s
Average neutron
yield
10
8
n/s
)
150 μs
300 μs
ak neutron yield
10
9
n/s
Average neutron
yield 10
8
n/s
100 200 300 400 500 600 Time (μs
300 μs
30 μs
Figure 3.14 Two modes of operation with an average output of 10
8
n/s, (a) peak neu-
tron yield of 10
9
n/s, pulse width 30 μs and (b) peak neutron yield of 2x10
8
n/s, pulse
width 150 μs.
TABLE 3.3 VNIIA LOGGING GENERATORS USING VACUUM VNT AND
GASFILLED GFNT NEUTRON TUBES
Type Marked Features
Flux
(n/s)
Lifetime
(h)
Diameter
(mm)
Length
(mm)
Frequency
(kHz)
VNT ING-10-
20-120
General 1.0 × 10
8
150 ...