Q = What are the dimensions of the lead castle?
A = 26mm outer diameter
15mm inner diameter
5.5mm wall thickness
35.5mm total height, including lid
3mm lid thickness.
Q = What are the half-lives and activity of these?
A = Americium-241 (alpha source): half-life 248 years, activity 185 kBq.
Cobalt-60 (gamma source): half-life 5.26 years, activity 185 kBq.
Strontium-90 (beta source): half-life 28 years, activity 185 kBq.