70_YEAR AIR DOSE CALCULATIONS As a consideration of the infinite doses received from operation HARDTACK on the various islands, the fallout incidents were treated separately. This assumes a ‘ackground increase due to a narticular detonation and the infinite dose received from that particular event is calculated. In the cases where an is- land received fallout on more than one occasion an attempt has been made to calculate the infinite dose for each fallout period, These values are then added together to obtain the total infinite dose received. It should be remembered that this is an air dose and not a body dose. tion: The calculations are based on the following equa- -0.2 ° . : : ‘ According to tue Empirical Relationship for Fallout Rt=h.t the expression for the gemma dose in air can be derived as: Ba= SR, (1-7 4) Or Ja= q R, Where Da= The gamma dose in air from H+] to a later time t, Ry is the dose rate at H¥] and can be obtained from the equation R= f Ry Where Ry is the dose rate at some time other than H+l and f is a proportional factor relating the two. Vy Both f and q can be read from tables and graphs provided for this purpose.