Notes
1. Gamma measurements made using Ludlum 14C survey
meter, calibrated March 1990.
2. Neutron measurements made with Nuclear Research Corp.
Model NP-2 survey meter, calibrated March 1990.
3. Dose rates for 8 mCi Cs-137source and a 40 mCi Am-
241:besource.
4. * indicates a reading less than 0.1 millirem/hr.
5. Surface indicates surface of case.
6. All readings in millirem/hr.
Source Encapsulation
The sources in the 3400 series gauges meet regulatory
requirements of U.S. and international authorities as Special
Form, or encapsulated, sealed source material. The "sealed"
sources used are encapsulated to prevent leakage of the
radioactive material and meet radiation safety requirements.
The neutron source (americium-241:beryllium) is compressed
and welded inside stainless steel capsules.
The photon source (cesium-137) is sealed in a welded capsule.
The only radiological health concerns to Troxler 3400-B Series
gauge users are the photon and neutron emissions for moisture
and density measurement. Proper use of this instrument
(following the instructions in this manual) and the shielding
design of the instrument will keep the exposure levels at a
minimum under normal conditions. It is, however, likely
required that personnel dosimetry be used when operating the
gauge.
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