COMPARATIVE SPECTRA AND '231 IN { |,O00 ' q IQ ,000 — t i | J 1 OF 99™Tc NECK PHANTOM i | } | oO a q ' | oe, ° gpl23 7 £000 - nm 6000 - o = — 2 5000 - . 3000 + ° . ono. | O ° Cy o cS o e mee | 2 l { 50 6 o * ” L _ o e “pet 1 - . o °o = o 2° ° {O00} e oo 0 oe 2000 , . — e 9 Por, e _ ° ° o Ce o _ , off oa : 0 ~ 6 ee, @ 4000 + ° e — l i © °° ° | ' ° ° ° q oe ec ewom Te { “6 e 9000 8000 | i ] ! | J i loo CHANNEL NO. 1 _ | | 150 i 8 eg FIGURE [ 50071308 . Fig. 1 3) (Neg # 11-513-7 8 f 200