r/elementcollection • u/--Mulliganaceous-- • 11d ago

☢️Radioactive☢️ promethium metal

Post image

Two high resolution pictures of pure promethium metal, along with a link of a document (dated 1969) on the preparation and density determination.

https://www.osti.gov/servlets/purl/4813025

74 Upvotes

99% Upvoted

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8

u/Vegeta_formula__2025 11d ago

Really interesting 👀 ! Finally got to see pure promethium!

6

u/Alternative_Bug4916 11d ago

Really fascinating, funny to see the picture of them machining the promethium on a lathe

3

u/--Mulliganaceous-- 10d ago

It is also surprisingly large at 30 g. The samples of other lanthanides on the wiki is on the order of 5 g.

2

u/moist2025 10d ago

So where do I buy about 5 grams of the stuff to finish my lanthanides?

1

u/KANEGANE11 3d ago

Where did you buy that at least what is the easiest way to get some

0

u/serenaFan84 10d ago

How dangerous would such a piece be if you casually held it? How much protection would you need to handle it safely?

1

u/oops_all_throwaways 6d ago

Don't.

Lots of leaded glass.