Document: NRC Regulatory Guide
Document ID: 688895c2-d1d9-44f3-9c79-3cf0daa88510
Document Type: regulatory_guide
Title: 
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739541.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.5
CFR Part: 
CFR Title: 

Content:
m isotopes in the Pu-236 source. Plutonium-236 should be corrected for decay if the decay period exceeds IS days. PFutonium-242 tracer, if available, could he used instead of Pu-236. There are several advantages to using Pu-242. First, its half-life is long (3.87 x 10 yr), obviating the nocesity for decay corrections. Second, since its alpha energy (- 4.9 MeV) is below the energy of either Pu.238 or Pu.239/Pu-240, the potential problem of "tailing" of a tracer peak into a lower-energy peak region in the detection system is eliminated. 4.5-9