Monitoring instruments - DOE-HDBK-1141-2001

Radiological Assessor Training

DOE-HDBK-1141-2001

Instructor's Guide

Per ICRP Publication 48, studies

Plutonium transferred from the initial entry site is

have indicated an average

assumed to be translocated to the liver (45%) and

partitioning of plutonium between

the bone (45). Retention half-life in the liver is 20

liver and bone of 30% and 50%.

yrs and in the bone is 50 yrs, according to

However, due to high individual

International Commission on Radiological

variability, use of the 45% liver

and 45% bone partitioning is still

Protection (ICRP) Publication 30.

recommended.

Control must be verified by a bioassay program.

Urinalysis is the most common technique, but

fecal analysis and in vivo monitoring may also be

appropriate.

DOE-STD-1121-99, Internal Dosimetry, provides

Review DOE-STD-1121-99,

technical guidance on internal dosimetry

Internal Dosimetry.

programs, including enhanced workplace

monitoring for instances where there is a

Discuss technology shortfall -

routine bioassay cannot reliably

technology shortfall, such as for plutonium. This

detect exposures of 100 millirem.

standard should be reviewed prior to conducting

assessments of internal dosimetry programs.

The standard also discusses appropriate

evaluation of bioassay results.

D. Monitoring instruments

Show OT 8.7.

Obj. 4

Portable instruments should be calibrated in

Describe appropriate

accordance with DOE G441.1-7, Portable

instruments, measurement

Monitoring Instrument Calibration. DOE-STD-

techniques, and special

1128-98 has additional guidance on monitoring

radiological survey methods for

plutonium.

instrumentation.

Facilities that deal with unencapsulated plutonium

should have continuously operating effluent

monitors to determine whether or not plutonium is

being released to the environment.

Module 8 7