Radioisotope thermoelectric generator
Criteria for selection of isotopes

Radioisotope thermoelectric generator

Section Title: Criteria for selection of isotopes
Table Section Text: None

Material	Shielding	Power density (W/g)	Half-life (years)

238Pu	Low	0.54	87.7

90Sr	High	0.46	28.8

210Po	Low	140	0.378

241Am	Medium	0.114	432

Sentence(s)

90Sr's half life of 28.8 years is shorter than that of ²³⁸Pu and it also has a lower a power density of 0.46 watts per gram.

final_sentence: 90Sr's half life of 28.8 years is shorter than that of ²³⁸Pu and it also has a lower a power density of 0.46 watts per gram.