Re: High Dose Rates in Sand - Brazil, Argentina or India

[Ivor Surveyor <isurveyor@VIANET.NET.AU>]

At 20:44 08-06-01 -0700, Joan Stovall wrote:

>The beach at Guaparj, Brazil is a high background area, due to the sand

>being radioactive .

>

>The Kerala Province of India is also a high background radiation area due to

>the soil being monazite sand (from decomposed granite) which contains

>uranium and thorium.

> >>>>>>>>>>>>>>>>>>>...

>

> >etc.) and what the dose rates are?

>

 >>>>>>>>>>>>>>>>>>>>>>>>>

To Radsafe:



Try Table 11 of UNSCEAR 2000   Annex B page 121.



For instance:



  BRAZIL   (Guarapari area) ;    Monozite Sand;  population 73,000

absorbed dose 90-170 nGy/h   in street;      90-90,000 nGy/h  beaches.



Kerala ; Monazite sands; population 100,000;    200-4000 nGy/h;   average 

1,800 nGy/h.



The Kerala monazite costal sands area is 200 km long and 0.5 km wide.





Information on high  background levels are given for nine different countries.

Ivor Surveyor [isurveyor@vianet.net.au]

Emeritus Consultant Physician

Nuclear Medicine

Royal Perth Hospital



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