ABC-M1A1 Radiac Calculator
ABC-M4A1 Nuclear Yield Calculator
Instruction & Sample Problem Card
The ABC-M1A1 RADIAC Calculator of the M28A1
Nuclear Calculator Set can be used to determine
the time of entry into a fallout area when the rate of decay is standard (n = 1.2). To determine the
time of entry using the calculator, you must set the known data on the calculator.
The dose rate is located
on the outer disc and aligned with the H + 1 hour mark on the intermediate disc.
Locate the total outside dose on the outer disc and note this position
in relation to the guide band on the
intermediate disc. Follow this guide band through the intermediate disc and
relative position where the guide band meets the inner disc. Rotate the inner
disc until the stay time fits
between the relative position on the guide band and the time of entry mark.
The time on the inner
disc at the time of entry mark represents the time after burst that personnel
may enter the fallout area. Note: This calculator is
only accurate for "Standard" decay rates. Use the nomograms inU.S.
Army Field Manual FM 3-12 Chapter 5 for "Non-Standard" decay rates.
Sample Problems For ABC-M1A1
Instructions For ABC-M4A1
ABC-M1A1 Radiac Calculator To Determine Radiation Dose Rates And Total
ABC-M1A1 Radiac Calculator Instructions
This is the "back" of the calculator referred to below.