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Large Volume Calibration Standards

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The model EG Series standards offer a convenient method to calibrate HPGe and NaI(Tl) detectors for the analysis of soil and water samples, reactor coolants, air samples, and other environmental materials. Standard activity is 0.1 μCi (3.7 kBq) - 5 μCi (185 kBq). Customer supplied containers will be filled upon request.

Large Volume Bottle Gamma Standards—EG-LVB
Series LVB wide mouth polyethylene sample bottles are available in 250 mL, 500 mL, and 1000 mL. Additional sizes are available upon request.

Marinelli Gamma Standards—EG-LVM

Series LVM Marinelli beakers, for both HPGe and NaI(Tl) detectors, are
available in 500 mL, 1000 mL, 2000 mL and 4000 mL sizes. This configuration is useful where maximum efficiency
is needed such as environmental samples. See table on page 32 for complete details on beakers.

1) Epoxy matrices will cure over time. Shrinkage may occur and cause density to increase slightly. There may also be separation of epoxy away
from the wall of its container which will not affect the function of the source.
2) Volumes of 100 mL and above only. Below 100 mL density can not be guaranteed.

Simulated Charcoal or Zeolite Gamma Cartridge Standards—EG-CH
Face Loaded: The activity is uniformly distributed between two polyimide films and placed under the screen of a 1” x 2.25” (25.4 mm x 57.2 mm) plastic charcoal cartridge (surface loaded).

Uniform Distribution: The activity is uniformly distributed within the charcoal or zeolite filling of the cartridge.

An aluminum metal cartridge is also available upon request. The standard activity for all configurations
is 0.1 μCi (3.7 kBq). Sources are NIST traceable for contained activity.

NOTE: I-125 and I-129 are available as surface loaded sources only. See “Simulated I-125” standards on page 45.

Radon-226 Canister Standard—EG-226C
These standards are used to calibrate radioassay systems for measuring nanocurie levels of environmental radon in standard EPA charcoal canisters. The gamma spectrum above the Ra-226 gamma at 186 keV (4%) is identical with that of Rn-222 and its daughters. The standard is prepared by uniform dispersion of a calibrated Ra-226 solution into the charcoal fill of a standard 1.25” x 4” (31.8 mm x 102 mm) canister, which is then sealed over the charcoal to define the charcoal volume and to prevent the escape of Rn-222 and its daughter products. The EG-226C is supplied with 20 nCi (740 Bq) Ra-226 and is NIST traceable. Calibration accuracy is within ±5% of the stated value at the 99% confidence level. Other activities and canister sizes are available on request.

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