R
Size: a a a
R
R
R
D
R
СТ
R
R
СТ
R
R
AG
SB
R
AG
R
СТ
N
D
In 2018 a Russian design based on 2-micron thick nickel-63 slabs sandwiched between 10 micron diamond layers was introduced. It produced a power output of about 1 μW at a power density of 10 μW/cm3. Its energy density was 3.3 kWh/kg. The half-life of nickel-63 is 100 years.