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)

²³⁸Pu has the lowest shielding requirements.

final_sentence: ²³⁸Pu has the lowest shielding requirements.