RE: 2 mrem/hr limit

["J. J. Rozental" <josrozen@netmedia.net.il>]

The value of 0.25 mrem/hr was derived from the public primary dose limit of
500 mrem/year, 10 % of occupational primary dose limit of 5000 mrem/year
(2.5 mrem/year, 2000 hours/year). This was before the adoption of the ICRP 60. 
The ICRP 60 recommends that the constraints for the optimisation of
protection in the design of new installations should be smaller than 1 mSv
in a year.


J. J. Rozental
josrozen@netmedia.net.il
Israel

At 01:57 PM 7/5/99 -0500, you wrote:
>In Canada, our nuclear medicine therapy licence states that "the
>licensee must ensure that the radiation dose rate in occupied areas
>adjacent to the patient room does not exceed 2.5 microsieverts/hour
>(0.25 mrem/hr) OR that other patients do not receive a radiation dose in
>excess of 500 microsieverts (50 mrem) per hospital stay".   
>
>Note that you can elect to meet either the dose rate restriction or the
>integrated dose restriction, but do not have to meet both restrictions
>simultaneously.
>
>Canada is soon moving to implement the ICRP recommended dose limit of 1
>mSv/year for members of the public and I believe the above licence
>condition will stay the same.  
>
>I'm not sure what other countries are doing, but obviously the limits on
>dose rate and/or integrated dose to patients in adjacent rooms  will be
>based on the dose limits or dose constraints established by each
>national regulatory authority.
>
>Karin
>*****************************************************
>Karin Gordon
>Radiation Safety Officer
>Health Sciences Centre
>GC214 - 820 Sherbrook Street,
>Winnipeg, Manitoba
>CANADA R3A 1R9
>
>phone (204) 787-2903
>fax      (204) 787-1313
>e-mail  kgordon@hsc.mb.ca    
>
>
>
>
>
>>----------
>>From: 	Malek Chatila[SMTP:mc02@aub.edu.lb]
>>Sent: 	Monday, July 05, 1999 6:26 AM
>>To: 	Multiple recipients of list
>>Subject: 	2 mrem/hr limit
>>
>>Greetings,
>>
>>For I-131 inpatients that has been administered therapeutic dose, does the
>>2-mrem/hr limit for the general public apply in the adjacent room?  
>>
>>Thanks in advance for your assistance.
>>
>>Malek Chatila
>>American University of Beirut
>>
>>
>>
>>
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>
jjrozental

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