ASTM E705-13
Standard Test Method for Measuring Reaction Rates by Radioactivation of Neptunium-237

Standard No.

ASTM E705-13

Release Date

2013

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E705-13a

Latest

ASTM E705-18

Scope

5.1 Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence rate with fission detectors.

5.2 ²³⁷Np is available as metal foil, wire, or oxide powder. For further information, see Guide E844. It is usually encapsulated in a suitable container to prevent loss of, and contamination by, the 8201;²³⁷Np and its fission products.⁴

5.3 One or more fission products can be assayed. Pertinent data for relevant fission products are given in Table 1 and Table 2.

TABLE 1 Recommended Nuclear Parameters for Certain Fission Products

Fission Product	Parent Half-LifeA (6)	Primary RadiationA (7) (keV)	γ Probability of DecayA (7)	Maximum Useful Irradiation Duration
95Zr	64.032 (6) d	724.192 (4)	0.4427 (22)	6 months
		756.725 (12)	0.5438