The transmission factor can then be calculated using the formula below:
It is pointed out that these transmission factors are not
necessarily the inverse of the correlation factors for the same
vehicle listed in Table 4-3 on page 4-22.
correlation factors in Table 4-3 were calculated using the best
position for the survey meter to give readings for radiological
The transmission factors in Figure 5-3 were
calculated to indicate the shielding afforded by vehicles to
personnel in the vehicles. Also, these transmission factors may
vary from other published transmission factor data for example,
the data on the ABC-M1 Calculator. The transmission factors used
in this manual are preferred over those on the back of the ABC-M1
b. Example Problem.
What is the calculated transmission factor of a bunker when the
outside dose rate is 200 cGyph and the inside dose rate is 25
Once the transmission factor is determined, further inside dose rates may be
converted to outside dose rates by dividing the inside dose rate by the
Outside dose rates may be converted to inside dose
rates by multiplying the outside dose rate by the transmission factor.
(1) The measured outside dose (OD) is 90 cGy. The inside dose (ID) is
calculated by use of a transmission factor. What dose would troops in M113
Armored Personnel Carriers receive?