Improvement in sample preparation for alpha liquid-scintillation spectroscopy

80

Letters to the Miter

IMPROVEMSlfF Ilf

sinoethe &wironmntal develo9.d tb

SAMPLEPBEPAUTIOIOFOR ALPEA I.JQUlD-SCIETIIJATIOlf SPECTROSCOPY

publlo8tion Sampl.8:

o? our 9qm,’

Cabined

nplutonlrn

Solvent

drmr1b.d

a8 a oon8iderabl8

th@ perohloric

all

rt8pr that reeultr

in

lkthod,”

with u8rohlorio 8y8t.m

into

a wthod

acid,

thrt the ?WiOU 8t8p OOo88iOl181t r.EmltOd in tb of tb

ID

perohlonte,

th8

lWmOv81 Of 80 much psrahloric

in rhloh ma found 8oid tb8t

plutoniu ~88 convertad into 8 ?o= not amtmbl~ to r8oovory br axtnotion

thr USintill8tOr OOnt8iniw di(i?-ot&rlhex&bo8phoric 8Oid (u., 8Ointill8tOr).

k

of

8cld i8 wapor8t.d to yield 8 1it)riU perohlomto ?Wiom.

'Iah8vO 2101mpl8o.d thil 8tep with 8n SvSpOlUtiOll8t oontroll8d t*M~r8tUlW.

IOn

u8 hav8

in a aim9li?io8tion

in it8 nllabilitj and reproduoibilitj.

hriap

a ~Ixod aitnta-perohlonte

for eomrertf~

.888ntimll$

inonarr

the paragraph lntitl8d

In Prooodw,

- Liquid Solntillation

Extnotion

an lm9rovomant I* on8 o? the 8lulJtio81

prooeduro 88 roll

and UnniLm Dotrr8ialation

ru~paot tht

tka plutoniro

imto

t]u ertr8Otiva

~88 being preoipitated 88 8n oxide or bydroua

ftuiar.

oxide 811~30it fr porriblo to precipit8te iron oxide duriaa tka llthiu pemohlorate BO8Ult8 Obt8inOd OVOr 8 PriOd Of 8 ?eW mOlIth#in OIICIrrboxMory indiO8tO th8t 8ll OQentor

uporiaIood tm

?8il8

to

NaoV8r

100%

of

th8

plutomi~

8bout on0 out of ten time8 In

8t.p; th0 f811WO l'8tai8 8OmWh8t hi,@Ur for Cm itW~riW%d

OpOlF8tOr.

Our prwent prooeddurr,which rlimla8k8 the difficulty 888ooi8trd with the '&Ion Tha 0.s

i8 88 ?OllOWS.

o? 8 8olution that 18 1.s in lithim &l th. 8trippin& O~rpitiOn equitnl8IIt8Wtd b

Of

nitrio aoid.

Ths

WIN8

i8 dilut8d

VOluW)

th8

sitriO

ndi8lIt h@8t8r8 8t 8

and 0.325 - 0.3zq!

warm,

899rOXb8te~

in 9erohloric

%O

80.

8trip 8OlUtiOlli8 thOn ha8ted

tI3QiCtr8tUXW Of 1% - 170' for 30 - 60 dn

t0 rO8loW th.

the oonoentrcrtedproduat (8bout 8 qwrter o? the origin81 ISi with 8 2.5$ W /V

8OlUtiOtl

Of

8Odi-

PWOXjlrrlpbatO.

final 8olutlon 18 8pproxiMtrly 3y,in Prchlor8tr and 0.05 - O.ioU_In perohlorio 8oid.

Or@niC

frm

thi8 801UtiOI3intotb

lOinti1l&Or IMP9b 9r+l'Od in thi8 my

zwolution

rwrw

91utOnirr ti

0th.r

8lph8-8mitti~

rlmilar

ha8 bwn

nuollder in 8 perchlonte wditr

dorign8d for obtsinirrg

for

UtnOtiOB

intO OOuntrr,

UI 8d

thir 8Ointill8tOr 8nd rO-extr8OtiX# intO 8 8Cilltill8tol: for 81ph8

h88 boon devaloprd.

ThO8e procodurO8rillb. I'O~rtOdBOM

iriluiB8

forthooaiag publio8tlon. Chomie8lDovelopwnt Sootion O8k aid@8 ~8tiOMl bbont~ 08k EMgo, Terme8880 37830, U.S.A. 25 8wtomber 1975

U.J. YaIJanll,

Im,

by thi8 prooedura hs routlnoly

prooedwa

rointill8tor for go88 81phr-OOUSltiQ5In 8 bOt8 liquid-sointillatioa

8 method o? 8trippiv m 8pWtrO8Om

A

8OilltilbtOr.

8xtraatin

h88 good pl&ls-hOi#ht, 9U28@-8h8gl, and

Ohrrr8OtOri8tiO8. Plutoalom raoowrj

lOO%, within OOUntilyl8t8ti8tiO8.

8rtnotiV8

1.

8cid.

nitr8tO 18 oouvortrd into pCWOhlor8t~, r@b8i~@

aoid t0 the 8qUaOtlrpb88e.

9lUtOni\mi8 extnotrddirwt~

ken

perchlorate

8miM

OOlltrOlbd

at111

8te9,

frrtirry amine nitntr eolution i8 8trlpprd with 8n qua1 volw

D.T. lkrrar,

8nd LB.=

W.J. y-11

‘?8bnt8,

1974,11, 1231.