From 2d01241b533b961ac2c9c4951855b6c2dbeed26a Mon Sep 17 00:00:00 2001
From: Olek <45364492+yardasol@users.noreply.github.com>
Date: Thu, 1 Sep 2022 14:33:44 -0500
Subject: [PATCH] Cleanup flow control for detecting nuclides

Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
---
 openmc/material.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/openmc/material.py b/openmc/material.py
index 4a988c5979..de4940a47a 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -438,8 +438,7 @@ class Material(IDManagerMixin):
             params['percent_type'] = percent_type
 
             ## check if nuclide
-            if str.isdigit(component[-1]) or (component[-1] == 'm'
-                                              and str.isdigit(component[-2])):
+            if not str.isalpha():
                 self.add_nuclide(component, **params)
             else: # is element
                 kwargs = params