State of New Mexico > Environment Department > Radiation Control Bureau
NMED Home Page

New Las Conchas Fire Air Sample Monitoring Information

DOE RAP Page

The air sample monitoring units were set in various locations and managed by the DOE Radiological Assistance Program as requested by the New Mexico Environment Department.  The air sample monitoring and locations were validated for accuracy by the New Mexico Environment Department, Radiation Control Bureau.

The air monitoring results for 137-Cesium, 239-Plutonium, and 241-Americium are below air effluent Concentrations as specified in Table II of 20.3.4.461 NMAC, and are in compliance with "Dose Limits for Individual Members of the Public" 20.3.4.413 and "Compliance with Dose Limits for Individual Members of the Public" as specified under 20.3.4.414 NMAC.

Air effluent concentrations are applicable to the assessment and control of dose to the public and are equivalent to the radionuclide concentration which, if inhaled over the course of a year, would produce a total effective dose equivalent of 0.05 rem.  Which is less than the 0.1 rem per year public dose limit.

1-MDA, Minimum Detectable Activity, is based on natural background, the time period of the measurement and the air sample monitoring volume (i.e. cubic meters) and was provided by DOE Radiological Assistance Program. The MDAs were calculated using the equation:

MDA = {3.29 [Rb Tg (1+Tg/Tb)]^0.5 +3}/(K Tg) where Rb = background count rate (detector specific) Tg = sample count time (usually 3600 s) Tb = background count time (usually 50,000 s) K = efficiency * alpha yield (1 for Pu & Am, 0.35 for Bi-212)

There will be slight variations in the MDAs due to different backgrounds for the detectors.  Also, the MDAs for the preliminary results will be much higher as the contribution to the background for the Pu-239/240 and Am-241 regions from Bi-212 alpha straggling was estimated and included in the calculation.  In general the MDA for the preliminary results was 0.01 nCi and for final results, without Bi-212 interference was 0.002 nCi.

2-NDA (No Detectable Activity), means there is no measurable activity above the 1-MDA.

 

   Location    Description

  City
 Elevation (ft)
Actual Corrected Flow (cubic meters)
Air Sample Start Date
Air Sample Stop Date

1-MDA

239-Plutonium  pCi/m3

2-NDA

239- Plutonium  pCi/m3

1-MDA

241-Americium  pCi/m3

2-NDA

241-Americium  pCi/m3

Holy Cross Hospital 
 
Taos
 
7096
 
519.9

 

6/30/2011

 

7/1/2011

 

0.00190

 

NDA

 

0.00130

 

NDA

Fire Station #2
 

Taos

 

6994

 

478.2

6/30/2011
7/1/2011
0.00042
NDA
0.00042
NDA
Embudo Clinic
 
Embudo
 
5929
 
488.1

 

6/30/2011

 

7/1/2011

 

0.00082

 

NDA

 

0.00082

 

NDA

Embudo Valley Library
 
Dixon
 
6091
 
456.9

 

6/30/2011

 

7/1/2011

 

0.00220

 

NDA

 

0.00180

 

NDA

New Mexico Environment Dept.
 
Las Vegas
 
6594
 
584.5

 

6/30/2011

 

7/1/2011

 

0.00150

 

NDA

 

0.00150

 

NDA

El Valle Residence
 
El Valle
 
7790
 
1052.2

 

6/30/2011

 

7/1/2011

 

0.00086

 

NDA

 

0.00048

 

NDA

Chimayo Residence
 
Chimayo
 
6189
 
1055.5

 

6/30/2011

 

7/1/2011

 

0.00114

 

NDA

 

0.00114

 

NDA

Hondo School (Incident Command Post)
 
Hondo
 
6486
 
537.4

 

6/30/2011

 

7/1/2011

 

0.00074

 

NDA

 

0.00056

 

NDA


  •    Location

     Description

    City
    Elevation (ft)
    Actual Corrected Flow (cubic meters)
    Air Sample Start Date
    Air Sample Stop Date

    1-MDA

    239-Plutonium pCi/m3

    2-NDA

    239-Plutonium pCi/m3

    1-MDA

    241- Americium  pCi/m3

      2-NDA

    241-     Americium  pCi/m3

    Holy Cross Hospital 
       
    Taos
      
    7096
      
    447.1

     

    6/29/2011

     
    6/30/2011
     
    0.00089
        
    NDA
     
    0.00067
        
    NDA
    Fire Station #2
       
    Taos
      
    6994
      
    468.0

     

    6/29/2011

     
    6/30/2011
     
    0.00064
        
    NDA
     
    0.00064
        
    NDA
    Embudo Clinic
     
    Embudo
      
    5929
      
    399.6

     

    6/29/2011

     
    6/30/2011
     
    0.00050
        
    NDA
     
    0.00050
        
    NDA
    Embudo Valley Library
       
    Dixon
      
    6091
      
    371.6

     

    6/29/2011

     
    6/30/2011
     
    0.00054
        
    NDA
     
    0.00054
        
    NDA
    New Mexico Environment Dept.
      

      Las

      Vegas

      
    6594
      
    448.0

     

    6/29/2011

     
    6/30/2011
     
    0.00045
        
    NDA
     
    0.00045
        
    NDA
    El Valle Residence
      
    El Valle
      
    7790
      
    955.5

     

    6/29/2011

     
    6/30/2011
     
    0.00010
        
    NDA
     
    0.00010
        
    NDA
    Chimayo Residence
     
    Chimayo
      
    6189
      
    791.0

     

    6/29/2011

     
    6/30/2011
     
    0.00051
        
    NDA
     
    0.00038
        
    NDA
    Hondo School (Incident Command Post)
      
    Hondo
      
    6486
     
    1719.2

     

    6/29/2011

     
    7/1/2011
     
    0.00052
        
    NDA
     
    0.00052
        
    NDA
    Hondo School (Incident Command Post)
      
    Hondo
      
    6486
      
    348.7

     

    6/29/2011

     
    6/30/2011
     
    0.00115
        
    NDA
     
    0.00086
        
    NDA

 

     Location

     Description

        City

  Elevation

     (ft)

Actual Corrected Flow (cubic meters)
Air Sample Start Date
Air Sample Stop Date

 

1-MDA             137- Cesium pCi/m3

 

2-NDA             137- Cesium pCi/m3
Holy Cross Hospital 
         
Taos
    
7096
    
294.8
 
7/1/2011
 
7/2/2011
    
0.0502
    
NDA
Fire Station #2
         
Taos
    
6994
    
294.3
 
7/1/2011
 
7/2/2011
    
0.0547
    
NDA
Embudo Clinic
       
Embudo
    
5929
    
160.7
 
7/1/2011
 
7/2/2011
    
0.1207
    
NDA
Embudo Valley Library
         
Dixon
    
6091
    
255.3
 
7/1/2011
 
7/2/2011
    
0.0783
    
NDA
New Mexico Environment Dept.
    
Las Vegas
    
6594
    
552.9
 
7/1/2011
 
7/2/2011
    
0.0385
    
NDA
El Valle Residence
       
El Valle
    
7790
   
1380.5
 
7/1/2011
 
7/2/2011
    
0.0146
    
NDA
Chimayo Residence
      
Chimayo
    
6189
   
1039.4
 
7/1/2011
 
7/2/2011
    
0.0192
    
NDA
Hondo School (Incident Command Post)
       
Hondo
    
6486
   
1719.2
 
6/29/2011
 
7/1/2011
    
0.0126
    
NDA
Hondo School (Incident Command Post)
       
Hondo
    
6486
    
467.8
 
6/30/2011
 
7/1/2011
    
0.0408
    
NDA

 

 



For information regarding this page, contact Michael Ortiz of the Bureau at michael.ortiz1@state.nm.us

 

page last updated