Neutron Dosimetry

1
Neutron Dosimetry

• Robert Loesch
• DOELAP Administrator
• HS-82, Office of Technology

2
Quantities

• Old 835 Deep Dose Equiv, HD
• New ICRP Effective Dose E
• New ICRU Personal Dose Equiv. Hp(d)
• HD and Hp(d) are numerically similar but
  different quantities

3
Radiation Related Factors

• ICRP 26 Neutron Quality Factor, Q
• Based upon incident neutron energy
• ICRP 60 Radiation Weighting Factor, WR
• Based upon deposition energy of neutron

4
Dosimeter Calibrations

• Neutron source emission rates ? NIST
• Fluence-to-dose conversion factors, Cn
• ICRP 74 (1995) recommendations
• ISO 8529-3 (1998) provides factors

5
Summary

• N13.11 WG willing to adopt ICRP-60, -74, ISO
  8529-3
• DOELAP will most likely adopt N13.11
• PNNL performs neutron irradiations for both
  DOELAP and NVLAP
• Changes in algorithms