Date: 5/4/2013
by: Dr. Christopher Busby
Video Description
Chris Busby says:
The decay of Radon, Rn-222 which involved gamma rays over the short term is as follows:
Rn-222 half life 3.8days , then Po-218 (3.05mins), Pb-214 (26.8mins), Bi-214 (19.9mins), Po-214 (164uSec), Pb210 (22.3y)
Of these only Ra-222 and Bi-214 give appreciable gamma radiation. The weighted contribution is about 60 Ra-222 to 80 Bi-214. The Brazil rain samples decay with an overall half life of about 37 minutes (16uSv/h to 1uSv/h in 150 min; Four half lives 16,8,4,2,1). If we assume that the radon was generated from radium a few hours before it was detected in the rain, that suggests Bismuth 214 as the origin of the signal. Bi-214 may have a higher concentration in the rain due to fractionation (since it is a solid and Ra222 a gas; it may form some kind of Bismuth hydroxide). The reason it is high in Brazil is there is a lot of Radium in Brazil. Of course, this means that rain can be a radon exposure hazard from external gamma and also drinking fresh rainwater. Not just in Brazil. I have not heard that anyone has realised this or that the official risk agencies have stated it anywhere. Look for diarrhea and flu like symptoms after heavy rain. Thanks to Samuel dal Pizzol and other radiation measurers for discovering this!
The decay of Radon, Rn-222 which involved gamma rays over the short term is as follows:
Rn-222 half life 3.8days , then Po-218 (3.05mins), Pb-214 (26.8mins), Bi-214 (19.9mins), Po-214 (164uSec), Pb210 (22.3y)
Of these only Ra-222 and Bi-214 give appreciable gamma radiation. The weighted contribution is about 60 Ra-222 to 80 Bi-214. The Brazil rain samples decay with an overall half life of about 37 minutes (16uSv/h to 1uSv/h in 150 min; Four half lives 16,8,4,2,1). If we assume that the radon was generated from radium a few hours before it was detected in the rain, that suggests Bismuth 214 as the origin of the signal. Bi-214 may have a higher concentration in the rain due to fractionation (since it is a solid and Ra222 a gas; it may form some kind of Bismuth hydroxide). The reason it is high in Brazil is there is a lot of Radium in Brazil. Of course, this means that rain can be a radon exposure hazard from external gamma and also drinking fresh rainwater. Not just in Brazil. I have not heard that anyone has realised this or that the official risk agencies have stated it anywhere. Look for diarrhea and flu like symptoms after heavy rain. Thanks to Samuel dal Pizzol and other radiation measurers for discovering this!
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