Talk:Isotopes of gadolinium

This does not conform to other "isotopes of" pages. Important info missing.

Does not note signoficant isotopes as do most other "Isotopes of" pages". Gadolinium notes specific nuclear/isotopic properties that should be here because they are properties on indivisual isotopes and not of Gadolinium as a whole. The (NMR) nuclear resonance characteristics are unique to some isotopes. I came here to look for the energy of gamma emitted after neutron absorption of Gd-157 (still used for cancer patient targeted radiation treatment although being supplanted by Boron-10). From Gadolinium "Gadolinium has the highest neutron cross-section among any stable nuclides: 61,000 barns for 155Gd and 259,000 barns for 157Gd. 157Gd has been used to target tumors in neutron therapy. This element is very effective for use with neutron radiography and in shielding of nuclear reactors. It is used as a secondary, emergency shut-down measure in some nuclear reactors, particularly of the CANDU type.[1] Gadolinium is also used in nuclear marine propulsion systems as a burnable poison." I was also miffed that meta 158Gd was not noted as it would be the intermediate after 157Gd neutron absorption. Shjacks45 (talk) 03:38, 21 February 2014 (UTC)

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Is the electron capture of ¹⁴⁸Gd possible but not yet observed?

The electron capture of ¹⁴⁸Gd is energetically allowed: the energy difference between ¹⁴⁸Gd and ¹⁴⁸Eu is (147.918115 - 147.918086)×931.4941 MeV = 27.0 keV. Note that this is even lower than 52.22 keV of that of ¹²³Te.

The situation is similar to the case of ⁴⁸Ca, ⁹⁶Zr and ²²²Rn. 129.104.241.214 (talk) 21:40, 21 October 2023 (UTC)

I added a note about this to Beta-stable. I think it's relevant because ¹⁴⁸Gd is given among beta-stable nuclides in Tretyak et al.'s 2002 tables. Double sharp (talk) 16:10, 28 December 2023 (UTC)

Possible alpha decay of ^{145,146,147,154}Gd

According to [1], ¹⁵⁴Gd (second primordial isotope of gadolinium) should have an alpha decay half-life at the order of 10⁵² years.

According to [2], ¹⁴⁷Gd (N = 83) should have a partial alpha decay half-life of at least 10¹⁹ years. Its alpha decay energy (1.74 MeV) is lower than that of ¹⁵²Gd (2.20 MeV).

As for ¹⁴⁵Gd (N = 81) and ¹⁴⁶Gd (N = 82), they have respectively an alpha decay energy of 0.58 MeV and 0.48 MeV (between that of ¹⁵⁴Gd and ¹⁵⁵Gd; in comparison to 3.27 MeV of ¹⁴⁸Gd), so their partial alpha decay half-lives should be long beyond imagination (at the order of 10⁷⁷ years for ¹⁴⁶Gd given by the Geiger-Nuttall law). 129.104.241.214 (talk) 20:43, 31 October 2023 (UTC)

Page 9 and Fig. 5 of this article gives an alpha half-life of ¹⁴⁶Gd at the order of 10⁹⁸ years. 14.52.231.91 (talk) 00:29, 22 August 2024 (UTC)

Does ¹⁵²Gd have especially high energy?

The Q_α-value of ¹⁵²Gd decaying to ¹⁴⁸Sm is 2204.4 keV, while the Q_α-value of ¹⁵⁶Dy decaying to ¹⁵²Gd is only 1753.0 keV. In other words, ¹⁵²Gd has energy a lot higher than the average of ¹⁴⁸Sm and ¹⁵⁶Dy. 129.104.65.9 (talk) 12:14, 9 October 2024 (UTC)