Table B.3 Kesponse to Uniform 4 Pi Distribution of Sources Over a Spherical Shell Helative to the Same Sources Concentrated at a Point at the Same Radius and on the Normal to the Instruments's Axis* KCVP#* Effective MEV*#** 75.00 .058 98 Mark I -—— 100.00 .087 150.00 .138 200.00 168 250.00 222 69°? 1.20 61 73 73 £85 --- Mark II 53 64 473 79 79 90 Mark IIT 71 84 83 -98 «93 -96 * See paragraph B.2.5. ## Kilovolt constant potential on the X-ray tube giving the beam. ### The effective photon energy, in terms of absorbtion in light elements which the Bureau of Standards believes exists in these beams. Table B.4 kvcP Effective Potential MEV 75 100 150 200 25 co * -058 087 138 -168 0222 1.200 See paragraph B.2.5 Computed Responses of Mark II to Uniformly Distributed Sources of Several Different Effective Energies* 90° Response in pa/mr/hr .08 .68 1.89 1.85 1.83 2.10 Response to 4 Pi Source Relative to Response to 90° Incidence 53 064 073 079 279 90 Effective Response to Distributed Monochromatic Source 004 pA/mr/hr 43 1.38 1.46 1.44 1.90 " " " " "