photopanel also gave a direct indication of dose in the cloud.

It re-

quired only that the mter be observed in the film frames where the

marker light occurred.
The NBC film packs gave an indirect measure of the dose in the
cloud, This was computed by subtracting the return flight dose which

was calculated from the T1B decay-rate masurements from the total dose
indicated by the film packs,
2.3.4

Dose on Return Flight.

The radiation dose on the return

flight was measured directly by the PeMeter, Bioscel, and Sigmatron.
In each instance all that was necessary was to subtract the dose in the
cloud from the total dose. The difference was the dose received on the
return flight.

TABLE 2,1

SUMMARY OF SOURCES OF REQUIRED DATA
Data directly available is indicated by x;
dodirectly available is indicated by 0.

Infornstion Desired

on Each Flight

bk

.

on

218

2 £

g Ssi 4

sf

a ii Salis

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2/43/8332] 8

Total Radiation Dose

x

x

Zz

Time in Cloud

x

x

Dose in Cloud

x

x

x

Dose on Return Plight

x

z

x

Maximum Dose Rate in

x

x

Average Dose Rate in

z

zx

Dose Rate at Cloud Exit

x

z

Decay Rate on Return

x

Contamination Factor

x

Cloud

Cloud

Flight

x

x

Zz

2

6
0

0

0

0

0

An indirect method of obtaining that portion of the radiation dose
received after exit from the cloud and during the return flight was by
extrapolation of the decay-rate curve measured by the 715 after the
aircraft was on the ground back to cloud-exit tim and integration of

the area under the curve from cloud-exit time to tims of landing.
2.3.5

Maxim Dose Rate in Cloud.

The maximum dose rate in the

20306 Average Dose Rate in Cloud.

The average dose rate in the

cloud was taken directly from the P-Meter and Bioscel curves, The pilot
also observed the maximm dose rate indicated by the Bioscel meter in
the cockpit.
cloud was calculated by dividing the dose received in the cloud by the

tims in the cloud.

Both of these were provided directly by the P-Meter,

Select target paragraph3