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Re: High natural background radiation areas
The ICRP 60 explain such concept: "Both equivalent dose and effective dose
are quantities intended for use in radiological protection, incluing the
assessment of risks in general terms. They provide a basis for estimating
the probability of stochastic effects only for absorbed doses well below the
thresolds for deterministic effects. For the estimation of the likely
consequences of an exposure of a known population, it will sometimes better
to use absorbed dose and specific data relating to the relative biological
effectiveness of the radiations concerned and the probability coefficients
relating to the exposed population"
About Monazite, please GO TO
http://www.galleries.com/minerals/phosphat/monazite/monazite.htm
In this site it is also interesting to learn that "The name monazite comes
from a Greek word, monazein, which means "to be alone". It is an apt name as
it is an allusion to the typical crystal habit of primary origin for
monazite as isolated individual crystals in phosphatic pegmatites. Solitary
crystals all alone in a dissimilar crystalline matrix. The name does seem to
fit."
Jose Julio Rozental
joseroze@netvision.net.il
Israel
----- Original Message -----
From: Peter Sandgren <peter.sandgren@po.state.ct.us>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Monday, January 22, 2001 3:48 PM
Subject: RE: High natural background radiation areas
>The text says "Usually is below 0.1 and a square before Sv/h. Normal
>background is in the range of 0.1 microSv/h. Therefore, in the black
>sand the dose rate is 131 microSv/h, good to be signposted as Radiation
Area.
Thanks for the clarification! Following the links back to the "Annual
Terrestrial Radiation Radiation Doses in the World" page
http://www.taishitsu.or.jp/radiation/index-e.html I see the radiation rates
are in Grays. The above measurement "131 microSv/h" comes from "zirconites
and monazites" according to the Brazil page. Can someone tell me what
isotopes, or at least what type of radiation, ie. alpha, beta, gamma, we
are talking about here? Thanks.
Peter Sandgren
Training Division
Connecticut Office of Emergency Management
-----Original Message-----
From: Bjorn Cedervall [SMTP:bcradsafers@hotmail.com]
Sent: Saturday, January 20, 2001 9:55 PM
To: Multiple recipients of list
Subject: Re: High natural background radiation areas
------
Thank you,
There was apparently a character translation problem. As we discussed a
couple of previous times - "micro" should probably always be spelled out in
computer systems to avoid any risk of misinterpretation,
Bjorn Cedervall bcradsafers@hotmail.com
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