JC277 & JC277-5 are excellent high flux neutron shields for power reactor and other industrial neutron shielding applications.
Power reactor and other industrial neutron shielding applications often require a material that exhibits a high-temperature resistance. JC277 & JC277-5 are excellent high flux neutron shields for power reactor and other industrial neutron shielding applications due to the inclusion of temperature resistant additives that provide hydrogen for moderation and boron for thermal neutron absorption.
JC277 is a refractory material that retains its shielding properties at temperatures up to 230°C (450°F) and its physical integrity up to 1038°C (1900°F). It is entirely non-combustible and is designed to be cast in the field.
It provides more than twice the hydrogen of ordinary concrete (equal to approximately 1/2 that of pure water) along with a boron content of 1.6% and 5% respectively. JC277 is provided as a dry mix for casting in the field, it can be shaped using standard concrete cutting/drilling tools and is typically provided in 300-lb fibre barrels.
Approximately 96-lbs. of dry mix are required to obtain one-cubic ft. of the cast material. (1.54 kg of dry mix will give one litre). Detailed mixing instructions are provided with each order. Recommended shelf-life under dry storage conditions is twelve months.
Features at a glance
- Contains more than two times as much hydrogen as ordinary concrete along with 1.6% to 5% boron additives
- Rugged “concrete-like” shielding is easily cast in the field
- Low-cost material
- Completely non-combustible
|Hydrogen atom density / cm³:||4.93 x 10²²||4.76 x 10²²|
|Hydrogen Weight %:||4.90%||4.73%|
|Boron atom density / cm³:||1.53 x 10²¹||4.67 x 10²¹|
|Boron Natural isotope distribution:||19.6% ¹⁰B and 80.4 % ¹¹B||19.6% ¹⁰B and 80.4 % ¹¹B|
|Boron weight percent:||1.63%||4.99%|
|Total Density:||1.68 g/cm³ (105 lbs./ft³)||1.68 g/cm³ (105 lbs./ft³)|
|Macroscopic thermal neutron cross section:||1.17 (cm⁻¹)||3.54 (cm⁻¹)|
|Gamma resistance:||1 x 10¹¹ rad||1 x 10¹¹ rad|
|Neutron resistance:||5 x 10¹⁹ n/cm²||5 x 10¹⁹ n/cm²|
|State:||Solid composite||Solid composite|
|Color:||Light gray||Light gray|
|Odor:||No odour||No odour|
|Machinability:||Fair: saw cut or drilled||Fair: saw cut or drilled|
|Tensile Strength (ASTM D368):||100 psi||100 psi|
|Compressive Strength:||1000 psi||1000 psi|
|Recommended Temperature Limit:||176°C (350°F)||176°C (350°F)|
|Coefficient of thermal conductivity:||1.24 x 10⁻³ cal-cm/sec-cm²-°C||1.24 x 10⁻³ cal-cm/sec-cm²-°C|
|(0.3 BTU-ft/hr-ft²-°F)||(0.3 BTU-ft/hr-ft²-°F)|
|Heat Capacity:||0.22 cal/g-°C||0.22 cal/g-°C|
|Cubical Coefficient of Expansion:||8 x 10⁻⁶ cm³/cm³-°C||8 x 10⁻⁶ cm³/cm³-°C|
|(1.4 x 10⁻⁵ in³ /in³ -°F)||(1.4 x 10⁻⁵ in³ /in³ -°F)|
|Chemical Name & Synonyms:||Borated hydrogenated mix||Borated hydrogenated mix|
|Trade Name & Synonyms:||JC277||JC277-5|
|Chemical Family:||Calcium salts, boron, hydrogen compounds||Calcium salts, boron, hydrogen compounds|
|Solubility in Water:||Negligible||Negligible|