neds Scaled he be aleLaie
od: cbeg Silaell
gS ees
RADIUM (pCi/gm)
14
0.05
|
5.0
|
15.0
10.0
20.0
PROTEIN NITROGEN (mgqm/gm)
Fig. 9.—The variation in the concentration of radium with the concentration of protein nitrogen for the Phaeophyceae
TABLE 4.
Species
Halimeda opuntia
AVERAGE VALUES FOR THE ANALYSIS OF Two MEMBERS OF THE Diviston Chlorophyta
Total organic, g/g
Protein nitrogen, ng/g
Calcium, g/g
[Ra]/[Ca], pCi/g
0.07 + 0.01
2.73 + 0.19
0.3824 + 0.018
0.145 + 0.022
0.24 + 0.05
8.46 + 1.13
0.244 + 0.014
0.188 + 6.043
(n = 6)
Penicillus capitatus
(n = 5)
is approximately 300% greater, there is no significant
difference in the value of the [Ra]/[Ca] ratio in these
two species on the basis of Student’s ¢ test.
The variations in the [M]/[Ca] ratio for radium,
thorium and uranium with inereasing degree of caleification for all samples are shown in Figures 10, 11
and 12. The ordinate at the left of each figure gives
the [M]/[Ca] ratio in seawater. The [Ra]/[Ca] ratio for
seawater was obtained from the data in Table 2, and
those for [Th]/[Ca] and [U]/[Ca] from the data on cal-
teale
2.02
to.s (f = 9)
2.26
cium in the same table and from published values fo.
thorium (0.05ng/ml) and uranium (38 ng/ml).“5
These ratios are: [Ra]/[Ca] = 0.20 pCi/g; [Th]/{Ca
= 0.18 ng/g; [U]/[Ca] = 7.5 ng/g.
Concentration of radium relative to calcium fror
seawater occurs in all but the most highly caleifiec
species, Halimeda opuntia (Figure 10) ; when the alga:
contain less than 50% calcium carbonate, the con
- centration factor varies between 5 and 100, with mos
species of algae having values between 2 and 40. Sim