Tan Initiator 9, Conversion of the stockpile of nuclear cores to naecommodate the new smaller initiator, storted in October, called Tom, which was 1950, hes been completcad. 10. The permissible lower limit of radioactivity for initiators has been reduced to half the previously specified value. On the basis of statistical probebility, the change wiil result ine slight increase in the nverare yield of weapons. This mocificstion appreciably reduces the nmount of polonium which must be produced to maintain initintors in the stockpile. i Fractional Crit Core Abee Fuze 12, The new electronic fuze (Abec), which has been produced for use in the Mark 5 and Mark 6 bombs and which may be used in the Mark 7 and Mark 12 bombs, wos designed to give maximum protection from the possibility of enemy jamming and 1s a highly complicated device. Several difficulties have .\become apparent a Y Sp) Ae TP ~<Satye VD ity ac Ro fa Coe TIAIE i