Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/678
Date:
To:
From:

27 January 2011
Distribution
N.Otsuka

Subject:

Expression of values under DECAY-DATA

The current EXFOR Formats Manual (IAEA-NDS-2007, February 2008) asks
compilers to use floating-point number expression for radiation energies andabundances (intensities) under the keyword DECAY-DATA. However this is different
from our usual practice.
ExampleThe annihilation radiation energy is not coded as 5.11E+02 but coded as 511..
The rules given in the current Formats Manual also contradicts some examples givenin the Manual.
The following amendment of the Formats Manual is proposed:
Half-life field. Contains the actual half-life of the nuclide specified, coded as a fixedpoint number with decimal-point or floating-point number (see page 4.2, noblanks are allowed), followed by a unit which consists of a code from Dictionary 25
with the dimension TIME; no embedded blanks are allowed.
…
SF2. Energy. The energy of the radiation in keV, coded as a fixed point number
with decimal-point (see page 4.2, no blanks permitted); no units are given in thecode.
…
SF3. Abundance. The abundance of the observed radiation per decay, coded as afixed-point number with decimal-point (see page 4.2, no blanks permitted).
…

The current rule is compared with an old rule manual shown in IAEA-NDS-3 Rev.
85/8 in the next page. Obviously the description of the old manual coincides with ourcurrent coding.

Comparison of the current rule and an old rule
EXFOR Formats Manual (IAEA-NDS-2007, February 2008):
Half-life field. Contains the actual half-life of the nuclide specified, coded as anumber, readable in an E11.4 format (see page 4.2, no blanks are allowed), followed
by a unit which consists of a code from Dictionary 25 with the dimension TIME; noembedded blanks are allowed.
…
SF2. Energy. The energy of the radiation in keV, coded as a floating-point number(see page 4.2, no blanks permitted); no units are given in the code.
…
SF3. Abundance. The abundance of the observed radiation per decay, coded as afloating-point number (see page 4.2, no blanks permitted).
Examples of coding for DECAY-DATA…
c) DECAY-DATA (25-MN-50-G,0.286SEC,B+,6610.)d) DECAY-DATA (25-MN-50-M,1.76MIN,DG,785.,,B+)…
g) DECAY-DATA (60-ND-139-G,30.0MIN,B+,,0.257,DG,405.,0.055)…

NDS EXFOR Manual (IAEA-NDS-3 Rev. 85/8):
2. Half-life field.
…
The format is nnnUNIT where nnn is a fixed-point number with decimal point, or
an E-format number with E and without blanks;…
SF4. Energy: The energy of the radiation in keV. It is coded as a fixed-point
number with decimal point (compare page 5.3), without a blank. No unit is coded.
…
SF5. Abundance: The abundance of the observed radiation per decay. It is coded as afixed-point number with decimal-point (compare page 5.3), without blank. …
C. Examples of coding for DECAY-DATA…
c. DECAY-DATA (25-MN-50-G,0.286SEC,B+,6610.)
d. DECAY-DATA (25-MN-50-M,1.76MIN,DG,785.,,B+)…
f. DECAY-DATA (60-ND-139-G,30.0MIN,B+,,0.257,DG,405.,0.055)…

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