4,
Combination of distance and shielding can be used to decrease
cost of shielding
5.
D.
Remote handling equipment
Time - Total radiation exposure in given field of radiation will
depend on the length of time in field
1.
Limit on time in which an operation may be done may be necessary
to keep within maximm permissible weekly exposure
2.
Jobs requiring large exposures are accomplished by rotating
workers so as to keep individual exposures within allowable
limits
3.
E.
Speed in operation is important
Group protective devices
1.
Area monitoring devices
a.
Portable surveying
b.
Appropriate instrumentation for the exposures involved
(1)
Ionization chamber - measures gamma, X-ray and presence of beta
(2)
Proportional type monitor - measures alpha and beta
radiation
(3)
Geiger-Mueller monitor - low and moderate radiation
intensities
(4)
Electroscope monitor - measures X-ray and gamma -~
gives total accumulated dose - measures radiation
from intermittent
sources
3-4