However, regardless of the stable iodine loading in the population, I believe that the thyroid dose from a radioiodine intake would be the same.
para 103 ICRP 56 (1989), "In the dosimetric model used for adults (ICRP, 1979) the normal adult gland is taken to contain 10,000 ug of stable iodine with a biological half-time of 80 days. After its entry into the blood, the fractional uptake of of iodine by the gland is taken to be 0.3. However, this varies considerably among individuals and in different countries as a result of different levels of stable iodine in the diet (Stather and Greenhalgh,1983). In countries with a very low intake of stable iodine the accumulation of radioiodine by the gland is increased. The low-level of iodine in the diet will, however, have resulted in a compensatory increase in the mass of the thyroid with the result that the concentration of radioiodine in the thyroid would be similar to that calculated using the standard model (Heinrichs et. al. 1983)".
The statement attributed to Henrichs et. al. seems to indicate that thyroid dose is relatively insensitive to dietary iodine deficiencies or sufficiencies because of a compensatory mass increase in the thyroid.
I have been looking for some time for evidence to support or contradict the view esposed above...
Ricky Khaloo
Site Health Physicist
Atomic Energy of Canada Ltd.,
2251 Speakman Drive, Mississauga, Ontario
khaloor@aecl.ca
905.823.9060 ext. 4532
-----Original Message-----In a message dated 11/16/2001 5:44:47 PM Eastern Standard Time, Chris.Marthaller@wipp.ws writes:
From: AndrewsJP@AOL.COM [mailto:AndrewsJP@AOL.COM]
Sent: Saturday, November 17, 2001 9:51 AM
To: Chris.Marthaller@wipp.ws; radsafe@list.vanderbilt.edu
Subject: Re: [Fwd: [OEM] [OEM!] US Bill: Mandatory KI Stockpiling]
And yes, that there iodized salt keeps
most thyroids pretty saturated one would think.