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The long-lived isotopes of mixed fission products, which present the
greatest internal rzdiation hazard to human inhabitants of a contaminated
area, were analyzed in plent,
soil and water samples.
Theseisotopes:
were the total rare earths, Sr%, Cs'3?7, and Ru!®® and comprised the
7
total detectable fission pr«cuct activity remaining 2 years after the
nuclear detonation,
Prior to nuclide analysis, samples of sufficient activity were submitted to gamma spectrum analysis ina single channel analyzer to
establish whether some uncxpected isotope was contributing to the acti‘vity.
‘
The nuclides were isolzted’? from samples which exhibited the great-
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CHAPTER
NUCLIDE COMPCSITION IN PLANTS, WATER AND SOIL
Oa gee mM Se gd,
apot an
est beta activity and wer: mounted on brass vlanchets, Corrections
for geometry, forescat::r, backs caiter, seif-absorption, and for window,
air and pliofilm absorz7icn were evuluated for Sr? by reference to data
procured from a Natioza! Bureau of Standards solution, The beta counting efficiency correct « Sor Aul®*, Cal37, and the total rare earths was
made by comparison wita U30s standard. An estimated error of the
order of + 20 per cent i: ay resuit from such cuipuriseon. Self-absorption, aix, window anc pi.ctilm absorptiow were calculated from aluminum
absorption curves of tha resnactive nuclides.
Absorption corrections
for the total rare earths were calculate! iron the aluminum absorption
curve derived frora Ce'.Fr “4, Beta ss2asurements were made on
the first shelf of an end-sindow, gas flow, croportional counter witha
geometry of 46 pes cent for the U30, standard mounted on aluminum,
In the case of Sr”, measurements were also made with Geiger counters
with a geornetry of 25 anc 30 per gent, Timples were analysed for
calcium by a flame phoiwnetzic niethtoo report Sr in surshine units
(defined as 2.2 cisinterations cf stront{.oiri-9) per minute per gram of
calcium)? The vorep:aratary procedur: lavelved weteashing the samples
with fuming nitric and perchloric acids acd removing phosphates by
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percolation of the dizert theougt an ai a axcnenne coluran,
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error in calcium determinations was wn the orderof 10 per cent.
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