Free Access

Table 1

Experimental activities measured with the LaBr3(Ce) detector mounted on the drone at various heights and for different measurement times.

Distance source — detector Acquisition time Photopeak Gross area ± uncertainty Efficiency Activity ± uncertainty Detection Limit Relative difference
(m) (s) (energy keV)   (x10–5) (MBq) (MBq) (measure/reference) (%)
    137Cs (661.7) 2830 ±130 4.96 1.1 ± 0.1 0.12 –99
1 60 60Co (1173) 3200 ± 100 3.31      
    60Co (1332) 3110 ± 70 3.02 1.6 ± 0.2 0.08 –98
    137Cs (661.7) 920 ± 70 0.0967 19 ± 3 3.6 –75
2 60 60Co (1173) 1170 ± 60 0.0648      
    60Co (1332) 1210 ± 50 0.0593 32 ± 4 2.5 –60
    137Cs (661.7) 2420 ± 120 0.0239 40 ± 5 4.7 –47
4 300 60Co (1173) 3100 ± 100 0.0161      
    60Co (1332) 3160 ± 70 0.0147 68 ± 8 3.6 –15
    137Cs (661.7) 580 ± 60 0.0036 64 ± 10 17 –15
10 300 60Co (1173) 690 ± 40 0.0025      
    60Co (1332) 590 ± 40 0.0023 91 ± 12 16 13

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.