repeat stan 7,
extract
90
.
-w
.
.
Yttrium from che 5% YDERP with two 50 ml volumes of 3N HNO,.
Shake 2 minutes for each extracticn and combine the 3N HNO, solutions
in a 250 ml beaker,
10.
evaporate the 3N HNO, solution to a volume of a few ml and
quantitatively transfer to a 50 ml centrifuge tube with several small
volumes of distilled 4,0,
ll.
place centrifuge tube in a not water bath and adjust pH tc 8-10 with
NH,OH to precipitate yttrium hydroxide,
12.
centrifuge and decant supernatant liquid,
13.
wasn precipitate with 10 ml distilted H.0, centrifuge and discard wash,
2
14.
dissolve precipitate in 1:1 HCl (1-2 ml), slurry and >ring volume to 25
ml with distilled 4,0;
15.
add 2-3 ml saturated oxalic acid, 0.5 - 1 ml NH, OH, stir and digest at
85-90°C for 1 hour,
16.
filter through preweighed glass fibre filter and dry at 100-110° for 10
minutes,
.
.
.
.
.
17.
weigh sample and paper and determine gravimetric yield of
18.
mount and beta count,
19.
.
- 2,
90
‘
count again in 24-48 hours to verify 9 Yttrium decay.
Counting Equipment
90
oe
4 aa
pe
Strontium is counted as its daugnter product
coincidence low background beta counter.
Ie Yetrium
pe
‘\
.
Yttrium,
es
.
using an anti-
The system has an absolute 51%
counting efficiency and a’ background range of 1.0 - 1.5 cpm.
ll
90
Recovery of the