
242 Ecological Sustainability
1. In the SI system of measurements, 1 sievert (Sv) ≡ 100 rem, and 1 gray (Gy)
≡ 100 rad (Quayle 2011; CDC 2011).
4.8.2.3 Sustainability and Nuclear Power
Beginning in 1955, worldwide development of nuclear power reactors has
grown exponentially until the 1986 Chernobyl accident, at which time the
world total number of active reactors had reached approximately 400. From
Amp. 2
Delay
line
t
Amp. 1
Relected
pulse, V
2
V
1
V
3
V
o
V
o
/2
V
o
/4
V
o
/8
V
o
V
2
V
3
= V
1
+ V
2
Preamp.
PMT
pulse, V
1
0.1 µs
High-voltage
power supply
Attenuator
Photomultiplier
γ-ray
NaI crystal
V
3
FIGURE 4.33
Block diagram of a scintillation-type radiation counter. What is actua