13.
Cool to room temperature before centrifuging.
Decant the supernatant
liquid and discard.
14,
Add 25 ml of distilled water to the precipitate and dissolve with
1:3 HCl.
15.
Repeat steps l2 and 13.
16.
Add 25 ml of distilled water, 2 ml of 6M ammonium acetate and 1 ml
of acetic acid.
The solution should be at pH 5.5.
17-
Heat in a water bath regulated at ~90°C.
18.
Add 15-20 drops of saturated oxalic acid solution gradually with
stirring.
19.
Allow the precipitate to digest.
20.
Remove from the water bath and cool to room temperature.
21.
Filter through a 2.8 om glass fiber filter using suction and a
fluorethens
22,
el.
Dry the precipitate in an oven at 110°C.
Mount the precipitate on a plastic disc, cover with Mylar and fasten
with a plastic ring.
23, Beta count, recording the hour and date. Stendardize with Y™
standard peecipitate and mounted in a similar manner.
Strontiu-85 Yield
i.
Evaporate the supernatant from step 8 under Second Milk to a volume of
approximately 25 mi and. transfer to a 50 mi volumetric flask.
Allow
to cool to room temperature and dilute to volume.
2.
Pipette 2 mi of this solution into a 5 ml gless vial, and dilute to
aprroximately 5 mi.
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