typical Sone burdens in the Marshallese, this means the levels in urine would 2e
vetween 0.1 to 1.0 pCi/liter.
age, sex, and location.
The samples are grouped for analysis according ‘to
aA ten liter sample is often required to obtain results
greater than the system's minimum detectadl2 Limits.
The procedure
is as follows:
l.
measure sample aliquots of 2.5 liters into a 4 liter >Deaxer,
2.
add conc. HCl to the sample to make the urine 0.2N in HCl and vield a
clean solution,
heat sample, with stirring, to a temperature of 85-90°C,
add 40 mg strontium carrier, 40 mg yttrium carrier,
1 ml 85 52 tracer,
40 ml of O.1M Cacl, and 8 ml of #470, 5
continue stirring for 30 minutes,
slowly add ammonium hydroxide until a basic pnosohate precipitate is
visible.
Continue the addition until the solution is basic to a pH of
9 or greater,
allow the precipitate to settle overnight,
aspirate the supernatant liquid to the lowest possible level such that
the precipitate is not discurbed,
filter the sample through a Whatman #42 ashless filter paper using dilute NH,OH wash solution to rinse the beaker and precipitate,
4
10.
transfer the filter paper and precipitate to a 150 ml pyrex beaker and
dry at 125°C for 1-2 hours,
:
place sample beaker in a muffle furnace and slowiy raise the temperature, over an eight hour period, to 500°C and muzfle at 500°C
overnight,
remove from furnace and allow to cool,