From 521e5a556e19b190f3babe2c790b1bee455858d6 Mon Sep 17 00:00:00 2001
From: Pim Nelissen <pim.nelissen@protonmail.com>
Date: Mon, 9 Feb 2026 15:32:19 +0100
Subject: [PATCH] Add isotope presets file

---
 src/pg_rad/isotopes/presets.py | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 src/pg_rad/isotopes/presets.py

diff --git a/src/pg_rad/isotopes/presets.py b/src/pg_rad/isotopes/presets.py
new file mode 100644
index 0000000..5b8224b
--- /dev/null
+++ b/src/pg_rad/isotopes/presets.py
@@ -0,0 +1,4 @@
+from .isotope import Isotope
+
+
+CS137 = Isotope("Cs-137", E=661.66, b=0.851)