Internal Monitoring Equipment Flashcards
Equipment used to perform internal monitoring
Four RADIACS used for internal Monitoring in conjunction with NNPP
PRM-5 with SPA-3 probe
(Single channel analyzer only used on CVN’s and being phased out)
AN/PDR-79 (IM-253/PD with SPA-3) use on CVN’s
Canberra FASTSCAN Whole Body Counter (WBC) Multi-channel Analyzer (MCA)
Canberra ASA-100 MCA- NaI(TI) crystal
all are scintillation detectors
PRM-5 with SPA-3
Detect low level gamma radiation. Portable, battery operated. Pulse Rate meter.
Responds energy range- 1.0 - 1.5 MeV for 60Co
AN/PDR-79 with SPA-3
used to detect low level gamma radiation. Portable battery operated. Pulse rate meter.
1.0 to 1.5 Mev for 60Co detection
Canberra FASTCAN
Stand up counter with two vertically stacked sodium iodide detectors. each 5 x 3 x 16 analyzes 100keV to 2100keV.
used at Navy Nuclear Power School
Canberra ASA-100 MCA
Detect low level gamma radiation. connected to 3 x 3 NaI crystal.
Principle behind scintillation
Device that converts the kinetic energy of ionizing radiation into light quanta
reacts with crystal freeing an electron leaving behind a hole
electron and positive hole migrate to the activator sites in the crystal
positive hole ionizes the activator site allowing freed electron to drop into excited state
electron emits a visible light photon as it de-excites
Minimum detectable activity (MDA) for the instruments used in internal monitoring
PRM-5 and SPA-3 probe and the AN/PDR-79- 10nCi- MDA 10nCi
Canaberra ASA-100 - MDA 5nCi
Canberra FASTsCAN MDA is 2nCi
List when internal monitoring is performed
Per- P-5055
Adults likely to receive 10% of an ALI in one year
Minors likely to receive a CEDE in excess of 0.1 rem
Declared pregnant workers likely to receive 0.1 rem during their pregnancy
Anyone who potentially inhales, ingested, absorbed, injected measurable amount of radioactive material of a mishap
Deemed necessary by cognizant MO, RHO, or RH director
No more than 3 months before starting duties involving potential of internal intake
Periodically on individuals performing duties with potential of internal intake
NNPP
Nuclear trained personnel authorized to receive occupational exposure receive internal monitoring
- Prior to being initially authorized to receive occupational radiation exposure
- At least within 180 days prior to separation from Naval Service or being transferred to a billet not directly associated with NNPP
- Occurrences suspected radioactivity was taken into body
a. wetted above the waist
b. documented skin contamination - Periodically, in conjunction with medical exam
- Conjunction with a radiation medical examination (shipyard)
- When deemed necessary by RHO