Ty ¢ exposure rate at tine 6
I) = exposure rate at wit tine
& os tim
Fe exposure between tines t and to, where t > 10 seconds.
It is expected that the decay of the residual refistion will vary
with weapon design.
Por example, the presence of Iy*-? would tend to
decrease the absolute value of the decay exponent for a period of tine.
1.3.3 Absorption in Air. The absergtion of mecattered game
refiation in air is exponential with distence.
Freon s point source af
monoenergetic radiation, the variation of intensity with distance is
expressed as;
eH?
Ips ite
A
ee:
were:
Ip « intensity et distance D
XI, « source intensity
n
« liner abeorption coefficient (this varies with gume energy,
anf is generally lower fer higher energies).
D = distance
ST. LOUIS FRC
The absorption coefficient // in Equation 1.2 is applicable fer
sarrow-beam geometry, andi a correction shoulé be made for field cenditions
woere the detector is approximately a 277 sensing element. ‘This is done
by adding a buildup factor B to Equation 1.2, te aceount for the scattered
radiation that will be detected.
Buildup factors for different energies
and Gistances have been calculated (Reference 10), ami some valuss are