. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. EXCHAXOE OF PHOSPHORIS TX TEETH 17 Table 9. Distribition in the after ."} DA'is. Lahelled PhOSPHORTS ) .Sl'Bt'rT.\NE()t'.SLY. Weight of the Rat abott 2()(t gm Part of the incisor (coinp. Kitr. 2> WeiRtit of the tissue in nis»i>i VVeifflit of the iv^li ill lutnii "r, I' f(i\inil per mgin tissue •^0 hibelled V found per niRm I (Proximal end) II Itl Ill IV ((.00021 V (Distal end) 9
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. EXCHAXOE OF PHOSPHORIS TX TEETH 17 Table 9. Distribition in the after ."} DA'is. Lahelled PhOSPHORTS ) .Sl'Bt'rT.\NE()t'.SLY. Weight of the Rat abott 2()(t gm Part of the incisor (coinp. Kitr. 2> WeiRtit of the tissue in nis»i>i VVeifflit of the iv^li ill lutnii "r, I' f(i\inil per mgin tissue •^0 hibelled V found per niRm I (Proximal end) II Itl Ill IV ((.00021 V (Distal end) in Fig. 1 B. The result of this experiment is seen in Table 9 and the dia- gram Fig 2. The content ol' labelled P varies between ai the proximal end and at the pulp-free distal end, thus diminishing by a factor 10 mm. Fig. 2. Distribution of labelled phosphorus in the int-isor of a rat killed 3 days after the administration of the phosphoius. The figures below give the relative amounts of labelled phosphorus present in 1 mgm of fresh tissue in the section in question. The figures above give the length of the .section in mm of 1/300. On comparing the activity of the ash obtained by igniting the incisor the figures work out to be and respec- tively, corresponding to a factor of 1/340. The average content of labelled P in 1 mgm tissue was found to be , in 1 mgm ash Fig. 2 shows both the location of the pulp and the distribution of the lal)elled phosphorus. It is seen clearly that the bulk of the labelled phos- phorus atoms are to be found in the vicinity of the pulp but an amount which is far from being negligible reaches even the remotest part of the incisor. In Fig. 2 we have inserted the relative abundance figures of the labellefl phosphorus present in the different parts of the incisor. A part of the first sector amounting to mm. grew during the time which elapsed between the injection of the labelled
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