ELJEN Products List EJ-321 series
Mineral Oil Based Liquid Scintillators
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This is a family of 4 different formulations, EJ-321L, EJ-321H, EJ-321P, and EJ-321S, all based on mineral oil.   The main difference between them is light output which varies primarily by the percentage of mineral oil in the various solutions.   Other properties which vary with the light output are optical mean free path, flash point, and hydrogen-to-carbon ratio.   They are recommended for use in large tanks including acrylic tanks where lower costs are important.
The tendency for chemical action on container components runs in parallel with the light output.   In the construction of acrylic tanks, it is strongly recommended that only cell cast sheet stock, not extruded materials, be employed.   Glue joints should be made with solvent action cements and should be annealed afterward.   Extruded tubing has been successfuly used but only after the inside walls of the cells had been passivated with a thin coating of polyvinyl alcohol.   EJ-321P may also be used in tanks fabricated with gray PVC plastic.
These liquids are normally packaged in 55 gallon ( 208 Liter ) drums, sealed under nitrogen.   Deliveries can also be made in 6000 gallon ( 20,000 Liter ) tankwagons and shipping containers.

properties EJ-321L EJ-321H EJ-321P EJ-321S
Light Output (%Anthracene)
saturated with Nitrogen
39% 52% 28% 66%
Light Output (%Anthracene)
saturated with Air
30% 40% 21% 51%
Mean free path ( 400~500nm ) > 5m > 5m > 6m > 4m
Specific Gravity 0. 86 0. 86 0. 85 0. 87
Wavelength of max. Emission 425nm 425nm 425nm 425nm
Decay time, short component 2. 0 nS 2. 0 nS 2. 0 nS 2. 0 nS
Refractive index 1. 47 1. 48 1. 47 1. 49
Flash Point (T.O.C.) 102°C 81°C 115°C 74°C
No. of H atoms per cm3 x 1022 7. 37 7. 03 7. 47 6. 48
No. of C atoms per cm3 x 1022 3. 66 3. 72 3. 63 3. 83
No. of Electrons per cm3 x 1023 2. 93 2. 94 2. 93 2. 94
EJ-321 Series Emission Spectrum
EJ-321 1 quart bottle

G-tech, Corp.    local representative in Japan
365-1, Sayamagahara, Iruma-shi, Saitama 358-0032
Phone# 04-2935-2777 Fax# 04-2935-2778  

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