Fnirsi GC-02 Gebrauchsanweisung Seite 26

④The relationship between radiation
source and distance
The intensity of the radioactive source is inversely
proportional to the square of the distance.
X=A г/ R2A: Radioactivity of point source;
R: Distance from source;
г: Exposure rate constant.
Note: Ra-226 (t 1608) г= 0.825 lun. m2/hour. curie
Cs 137 (t 29.9 years) г= 0.33 lun. m2/hour. curie
Co 60 (t 5.23 years) г= 1.32 lun. m2/hour. curie
Calculate radioactive shielding based on the
radioactive decay calculation table:
Reduce by half and 1/10 of different substances (cm)
Radioactive
source
Halving
Cesium-137 0.65
Iridium-192 0.55
Cobalt-60 1.10
7.NOTE
Nuclear radiation
instruments, please pay attention to protection. The
following suggestions
instrument maintenance and extended service life.
Pencil
1/10
Halving
2.2 1.6
1.9 1.3
4.0 2.0
detectors
will
Iron Concrete
1/10 Halving
5.4 4.9
4.3 4.3
6.7
6.3
are
be beneficial
1/10
16.3
14.0
20.3
precision
for