Neutron Putty


JC261 Neutron Putty can be used for the collimation of neutrons and for reducing neutron streaming. 

It is a non-hardening, boron loaded LDPE putty that contains 10% boron combined with a high hydrogen content.  

Neutron Putty can be kneaded by hand to obtain the desired consistency and workability.  It can be softened by warming it up slightly for added workability.

Disposable gloves are recommended when handling as the putty is quite sticky.

  • Neutron Putty contains 10% boron and high hydrogen content.
  • A 1-inch thick layer has a thermal neutron attenuation factor of approximately 100
  • Since Neutron Putty is non-hardening, it will not dry out to form a powder
  • Provided in 8lb (3.6 kg) cans
Composition Data Important Properties
Hydrogen atom density/cm³ 5.91 x 10²²
Hydrogen weight percent 8.95%
Boron atom density/cm³ 6.16 x 10²¹
Boron natural isotope distribution 19.6% ¹⁰B and 80.4 % ¹¹B
Boron weight percent 10.00%
Total Density 1.11 g/cm³ (69 lbs/ft³ )
Radiation Properties
Macroscopic thermal neutron cross section 4.67 cm⁻¹
Gamma resistance 5 x 10⁸ rad
Neutron resistance 2.5 x 10¹⁷n / cm²
Physical Properties
State Putty
Colour White
Odour No significant odor
Machinability Poor
Thermal Properties
Recommended Temperature Limit 45°C (110°F)
Chemical Properties
Chemical Name & Synonyms Borated poly putty (LDPE)
Trade Name & Synonyms JC261 Neutron Putty
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