Beta/Gamma Disc Sources

Durable, sealed disk sources for routine functional checks, teaching and emergency preparedness. Choose from common beta/gamma isotopes, activity levels from 0.05 to 100 µCi (≈ 1.85 kBq to 3.7 MBq), with optional secondary calibration on gamma sources for tighter accuracy.

Key features

• Ready for everyday verification: ideal for gamma counters/spectrometers, radiation protection probes and training exercises.
• Two convenient sizes: 25 mm (1″) or 50 mm (2″) plastic disks to suit your detector geometry.
• Activity options to suit your program: 0.05–100 µCi with metric equivalents shown for Australian users.
• Calibrate to your tolerance: standard activity tolerance ±20%; optional secondary calibration (NIST‑traceable) to ±5% for gamma sources. Beta sources are not available for secondary calibration.
• Versatile applications: laboratory QA/QC, radiation safety checks, education, and security/emergency drills.

Technical specifications

• Available isotopes (beta/gamma): Ba‑133, Cd‑109, Cs‑137, Co‑57, Co‑60, Eu‑152, I‑125, Mn‑54, Na‑22, Sr‑90, Tl‑204, Zn‑65.
• Disk sizes: 25 mm (1″) or 50 mm (2″) diameter plastic disks.
• Active deposit (typical): ~2–3 mm diameter central spot.
• Activity selections (µCi → kBq/MBq):
  0.05 µCi ≈ 1.85 kBq; 0.10 µCi ≈ 3.7 kBq; 0.25 µCi ≈ 9.25 kBq;
  0.50 µCi ≈ 18.5 kBq; 1 µCi ≈ 37 kBq; 5 µCi ≈ 185 kBq;
  10 µCi ≈ 370 kBq; 25 µCi ≈ 925 kBq;
  50 µCi ≈ 1.85 MBq; 75 µCi ≈ 2.775 MBq; 100 µCi ≈ 3.7 MBq.
• Calibration options: standard ±20% to nominal; optional secondary calibration to ±5% (NIST traceable, gamma only).

Applications

• Laboratory functional checks of gamma counters/spectrometers and routine QA/QC
• Radiation protection: probe/system checks and periodic verifications
• Training & education: demonstrate decay, half‑life, energy spectra and interactions with matter
• Security & emergency exercises: drill/testing of portable identification devices

Compliance & standards

Classified as exempt quantity sources under US NRC rules (per manufacturer). Australian requirements differ by state/territory and isotope; ordering, possession and use may require licences/approvals under state/territory regulators and ARPANSA guidance. J3Seven can assist with documentation.

What’s included

• Single plastic disk source with selected isotope, activity and size
• Manufacturer documentation; optional secondary calibration certificate when selected (gamma only)

Options & related products

• Secondary calibration (NIST‑traceable) for tighter activity tolerance (gamma only)
• Complementary formats: Rod Sources, Laminate Disk Sources, and Alpha/Beta/Gamma sets (RSS5/RSS8) for teaching labs

Maintenance & support

Store and handle in line with your radiation management plan. J3Seven provides local support for selection, compliance documentation and after‑sales service.

FAQs

Which isotopes are available?
Ba‑133, Cd‑109, Cs‑137, Co‑57, Co‑60, Eu‑152, I‑125, Mn‑54, Na‑22, Sr‑90, Tl‑204 and Zn‑65.

Can I get a calibration certificate?
Yes—choose secondary calibration for a NIST‑traceable value within ±5% of the label (gamma sources only). Without this option, delivered activity is typically within ±20%. Beta sources are not available for secondary calibration.

What sizes are available?
Two plastic disks: 25 mm (1″) and 50 mm (2″).

Are these ‘exempt’ in Australia?
“Exempt quantity” is a US regulatory term. Australian requirements vary; check your local regulator. J3Seven can assist with the paperwork.