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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
C. Criticality
Uranium-235 and Uranium-233 are both fissile
materials; therefore, facilities handling enriched
uranium and/or Uranium-233 have the potential
for criticality accidents, generating large
amounts of neutron and gamma radiation.
D. Toxicological properties of uranium
Obj. 2
Describe the toxicological
Uranium is a heavy metal poison and is toxic in
properties and behavior of
uranium.
much the same way lead or mercury is. For
soluble compounds of low enrichments (< 5%
See Table 2-13 of
Uranium-235), the toxic properties of uranium
DOE-STD-1136-2000
override the radiological hazards. The kidney is
the primary organ of concern.
For insoluble compounds of any enrichment or
all compounds of highly enriched uranium, the
radiological hazards are limiting.
Show OT 6.5.
III. Detection, measurement, and survey techniques
Obj. 3
A. Monitoring program
Identify appropriate
instrumentation, measurement
A radiation protection monitoring program in a
techniques, and special
uranium facility must ensure the detection of
radiological survey methods for
typical ionizing radiations over wide energy
uranium.
ranges.
To detect alpha radiation from the uranium
isotopes, exposure rate surveys using photon-
sensitive portable and fixed alpha detectors
such, as zinc sulfide or gas proportional
counters, should be used.
Appropriate beta detection instrumentation
should be available to measure decay products
such as Protactinium-234m. If Technetium-99 is
suspected, special low-energy beta particle
detection equipment should be available.
Module 6 6
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