I have completed questions 1 and 2 but I am stuck on question 3.....

1 . Suppose a narrow beam of uncharged radiation consists of one - third of particles of energy 2 MOV , for which wp = 1.00 x 10* m/'KE one - third of particles of energy 5. MOV , for which wip = 3.00 x 10 * m= / KE one - third of particles of energy ? MeV , for which w/p = 1.00 x 10 * 12 /KE [ a ] What average value ( IP ) will be observed by a particle counter when a thing layer of the attenuator is interposed in the beam , with narrow - beam geometry ?" ( b ) What average value [ w/P )_ will be observed by an energy fluence meter ? ( still narrow beam geometry* !* ans . ( 2 ) 4.67* * 10*$ 12 / KE` ( b ) 3.00 * 10 *$ 12 / Kg 2. Same as question 2 , but let the beam first pass through 250 KE /'mn Z of the attenuator ( If you must , think of the material asp = 10 * KE /'m and 1 = 0.025 m ) . still in narrow beam geometry . alls . ( 2 ) 4.31 x 10*$ 172 / Kg` ( b ) 2.79 x 10 -$ 17} / K^ 3. Now switch to broad beam geometry and use the buildup factors to find "! ' !` from '!'" for each energy photon . What average value ( Hip ) will be observed by an energy fluence meter at L = 1 m ? ( Use the table of energy fluence buildup factors , B , for the mystery material . ] ans . 1.3 x 10 * m / KB "Table of energy fluence buildup factors , B, for mystery material ElMOV ELMONT\\ ELMOVY ElMOV'S ELMONT ELMONT* ELMONT EIMOV'S I'D 4. 65 3.2 2.37 2. 05 1 . 8 1.72 1. 6.4 1.58. HIL 2 8. 43 5. 03 3.31 2. 76 2.23 2.17 2.01 1.815 MIL 13. 8 7. 36 4. 35 3. 42 2. 82 2.38 2.25 MIL 19 . 1 5. 35 4. QB 3.3 3.0125 2.75 2.58.5 45. 1 1 8 . 7 8. 65 6 . 09 A . B 4.29 3. 7B 3. 495 TH HIL $2. 3 2 B. B. 6. 47 5. 65 4. 83 4. 4