P-Therphenyl

From Detec-Rad.com

(C₁₈H₁₄)

¹³⁷Cs spectrum for p-terphenyl detector 80 dia. x 5 mm; ¹³⁷Cs radionuclide source irradiates 125 conversion electrons per second through a collimator and 1.5x10⁵ gamma photons per second in 2-π geometry

Through the introduction of special dopants into p-terphenyl, light output can be increased by a factor of 4 to 5.

Doped p-terphenyl can be used for the detection and spectroscopy of alpha and beta particles and neutrons. It exhibits a short decay time (τ ≈ 3-4 ns) and a temperature-independent scintillation yield within a wide temperature range (- 80°C +150°C).

Single crystals of p-terphenyl are translucent, knotty over the whole volume, plastic, water-insoluble, and poorly soluble in organic solvents.

Scintillators based on doped p-terphenyl crystals are used in β-radiation spectrometry, where they are the most effective organic scintillators. They are also used in α-radiation spectrometry, as well as for fast neutrons detection in high γ-radiation background in schemes for radiation discrimination by scintillation pulse shape method.

Due to short decay time, p-terphenyl can be used in the spectrometry of high-intensity radiation

• Short decay time
• High light yield
• Lowermost light output anisotropy
• Environment resistant

Applications

• Detection and spectroscopy of α and β radiations
• Fast neutron spectroscopy n/γ

Physical Properties of p-Therphenyl

²⁴¹Am spectrum for p-terphenyl detector 20 dia. x 10 mm