Re: ANNUAL DOSE, DOSERATE and the MAXIMUM INDIVIDUAL

[Ted de Castro <tdc@XRAYTED.COM>]

Quintino De Notariis wrote:

> 

> If the ANNUAL dose limit for the public is an EFFECTIVE DOSE (ED) of 1

> mSv/year, why some radsafers seem to take for granted that this IMPLIES a

> DOSERATE limit of 0,114 microSv/h (1000 microSv/year x 8760 hours/year) ?



Who does that???  I never do.



> 

> So if, for example, in an X-ray facility we MEASURE 0,200 microSv/h above

> the background in correspondence of a door on an alley with a very limited

> or no time occupancy by members of the public (say, ONLY 1 hour/year),

> should we conclude that that facility is out of low, no matter that the

> total ED in a year would be ONLY 0,200 x 1 = 0,200 microSv ?



Of course



> 

> Regulations give an ANNUAL dose limit NOT a DOSERATE limit.



yes



> 

> Somewere I've read that requiring the limit of 0,114 microSv/h INSTEAD of 1

> mSv/year is the consequence of the hypothesis of the "MAXIMUM INDIVIDUAL"

> (that's to say, a person who stays behind that door 24 hours a day for 365

> days = 8760 hours/year).



ridiculous!



   

> Another related question :

> I don't think that one could MEASURE EFFECTIVE DOSE with an instrument,



correct

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