(a)
Resin columns may present external radiation
hazard because of radium concentrations
(2)
Solvent extraction
(a)
Solvents used are chemically toxic
(b)
Reassignment of personnel allergic to solvents
Drying of final uranium product (yellow cake)
(1)
Most severe radiation problem area in milling
(2)
Uranium is so concentrated that dust levels must be
kept very low
(3)
Drying methods in general use
(a)
Double-drum, steam-heated dryer - dust problem is
severe
(b)
Tunnel type dryer - relatively dust-free
(c)
Multiple hearth dryers - dust problem
Uranium ore stockpiles
(1)
May present fairly high radiation field
(2)
Personnel don't spend much time in this area
Tailings piles
(1)
Presents a high radiation field
(2)
Men working a 40-hour week in this area can receive
100-150 mrem
Physical control of radiation hazards
a.
Dust control
(1)
Mechanical ventilation
16-4
=~ ct. eee
ee
a