i
19,000 second count for !3’cs and 49K are 2.5 and 35.0 pCi respectively.
Pocassium-40 is a naturally occurring radionuclide and is normally found in
urine at concentrations of 1500 pci/2% = 30% (one standard deviation).
.
amma analysis,
w
}
Following
.
.
.
90.
sample aliquots are returned to the original sample for
Sr
~
q
o
9
and/or 23% 5K analyses.
SAMPLE PREPARATION FOR 7052 ANALYSIS OF TEETH AND MILK
Reagents
8
.
> strontium Tracer
Strontium Carrier
Yttrium Carrier
Cation Exchange Resin
Nitric Acid
Nitric Acid
Hydrogen Peroxide
50W x 8
Conc.
8N
30%
Hydrochloric Acid
Conc.
Hydrochloric Acid
0.08N
Care should be taken to record all fresh and dry weights on all samples
from which water is removed.
The following procedure is to be performed on milk
samples:
1.
to al liter sample of milk add 1 al of 85. r tracer, 40 mg of strontium
carrier, 40 mg yttrium carrier and stir,
2.
add 40 grams of washed 50W x 8 cation exchange resin and stir for at
least 30 minutes,
3.
allow the resin to settle overnighte,
4+.
remove the milk with suction, taking care mot to disturb the resin,
5.
wash the resin with 400 ml of distilled water and remove it with suc-
_
tion, discard the milk and wash water,