RESULTS AND DISCUSSION
Daily Activity Ingestion Rates
Daily activity ingestion rates were calculated for dosimetrically significant nuclides post return,
An exponential decline was proposed for the inges-
tion rate within a population subgroup and initial reference values are given in
Figures 10 through 14 (June 1, 1957, was assigned as @ return date to Rongelap).
Figure 10 demonstratee the differences in ingestion of 1376, for various popila-
tion subgroups.
This undulating pattern was exhibited by 1376, 905, and Orn,
nuclides for which sufficientdata existed for analysis.
Differences in ingestion rates of the stable element at: the same geo~
graphic location have been shown to occur among members of a population (ICRI
tay
23).
+etd
Age dependent diet studies for ingestion of Cs for urbah' Japan have valuen
varying from 1l yg av} for adults cto 8.6 ug a”for children,
Sein a westein
Fe ingestion in a western type diet has a mini~
mum at age 3 and maxima at ages 1 and 20 years.
Co is ingested at a rate of 2()
ug avi for Japanese adults and half this amount for children.
The Marshallese
population also exhibits dietary changes as a function of age.
The authors of
the Marshall Islands Diet and Living Pattern Study (Na80) observed coconut sap
being used as a major food supplement for infants, and later in adult life as 4
major source of daily fluid intake.
Since coconuts and coconut tree sap pro-
vided the major source of 13705 on Bikini Atoll (Le80, Mi80), the shape of Fig:
ure 10 was in agreement with the observed diet pattern.
22
ant
observed in adult tea drinkers.
BEE “Be
abSy“ae
a8
in the United Kingdom rose from 2 to 40 mg al, the higher value of Zn being
weal
+
=
3,600 yg a7} for 13 year olds and fell to a mean of 1,900 isa"*tor adults. 2n
ee a _ “ee
Oe: ne
at:
ogee
type diet rose from 600 pg a7!for infants to 690'ug d7 fox 5 year olds to