T.O. 33B-1-1
6-130
6.9.12.2.3
Refer to Personnel Monitoring, paragraph 6.9.13. for personnel monitoring requirements.
6.9.12.3
Dosimetry (TLD) Service.
6.9.12.3.1
Air Force.
Dosimetry service for Air Force installations is provided by Armstrong Laboratory, AL/OEBD, 2402 E Drive, Brooks
AFB, TX 78235-5114, through the base RSO, in accordance with the provisions of AFI 48-125, USAF Personnel
Dosimetry Program.
6.9.12.3.1.1
The Air Force Bioenvironmental Engineering Service is responsible for the dosimeter program at base level. This
organization will receive all routine reports issued by the Armstrong Laboratory. The Base Radiation Safety Officer is
also responsible for investigating all dose reports which exceed predetermined action levels and for insuring that all
records of radiation dosage are property maintained for each individual on the program.
6.9.12.3.2
Army.
DA (and DLA) activities, to include reserve forces, are required to use the Army dosimetry service provided by the US
Army Ionizing Radiation Dosimetry Center (AIRDC), TMDE Activity, ATTN: AMXTM-SRD, Redstone Arsenal, AL
35898-5400. Organizations initiating industrial radiography operations should contact AIRDC in advance to assure
receipt of dosimeters prior to the date on which such operations are scheduled to commence prior.
6.9.12.4
9-63A. Electronic Personnel Dosimeter (EPD).
Although approved by NVLAP (ANSI-N13.11) as a dosimeter of record in lieu of a TLD, the EPD is currently used
within DoD for instant readout of dose and dose rate. It measures gamma and X radiation over the range of 20 keV to
6 MeV and beta radiation from 250 keV to 1.5 MeV, and it provides a readout of both skin (7 mg/cm2) and deep dose
equivalent (1000 mg/cm2). The readout provides a dose equivalent range of 0.1 to 1000 rem. The radiation is detected
by three silicon diode detectors which save data to secure memory every few minutes and provide visible and audible
alarms if either the accumulated dose or dose rates exceed specified levels. Doses are checked periodically throughout
the day when performing radiography and are recorded in the dosimetry log at the end of each day of operation for
comparison with TLD results. EPDs are submitted for calibration on an annual basis at which time long-term dose
memory is reset to zero. They are used in the same manner as TLDs.
6.9.12.5
Digital/Personal Alarm Dosimeter (DAD/PAD).
The DAD/PAD is a pocket dosimeter designed to replace the direct-reading pocket dosimeter. It is used in conjunction
with, but never in lieu of the TLD. The DAD/PAD is approximately the size and shape of a typical telephone paging
unit. It provides both a visual and audible indication in direct proportion to radiation-intensity/dose-rate. The term
"chirper" is also used as a common name for this type of dosimeter because of the audible sound emitted when operated
in the presence of radiation. The DAD/PAD SHALL be worn between the neck and waist on an outer garment. It may
also be worn on a belt provided the DAD/PAD's securing clip is designed for attachment to a belt.
6.9.12.5.1
CAUTION
Geiger Mueller tubes will saturate at high dose rates (R/hr). They are never to be
used in areas where dose rates can reach these levels.
The DAD/PAD is a solid state dosimeter that uses a halogen-quenched, filtered Geiger-Mueller (GM) tube for detecting
and measuring radioactivity. The GM tube converts the radiation detected into pulses which are fed to an amplifier and
then to a pulse-division circuit which produces an output to the digital display counter whenever pulses equivalent to
one dose increment have been accrued. At the same time, the division circuit output actuates the audible system and
