GIVEN:

Rt = 200 cGyph at H + 5 hours.

FIND:

R1.

SOLUTION:

Align the hairline with the 5-hour tickmark of the 1.2 (index)

scale and the 200 cGyph point on the Rt scale. Read the dose

rate at H + 1 as 1350 cGyph at the point of intersection of

the hairline with the R1 scale.

ANSWER:

1350 cGyph.

GIVEN:

R1 = 1000 cGyph.

FIND:

Rt at H + 6 hours.

SOLUTION:

Align the hairline with the 6-hour tickmark of the index scale

and the 1000 cGyph point on the Rt scale.

Read Rt as 120

cGyph at the point of the intersection of the hairline with

the Rt scale.

ANSWER:

120 cGyph.

GIVEN:

R1 = 1000 cGyph.

FIND:

Time when Rt = 700 cGyph.

SOLUTION:

Connect 1000 cGyph on the R1 scale and 700 cGyph on the the R1

scale with the hairline.

Read time as H + 1.4 hours at the

point of intersection of the hairline and the index scale.

ANSWER:

H + 1.4 hours.