diff -u -r -p1 -N radioactivity_orig/plugins/radioactivity_flag.info radioactivity/plugins/radioactivity_flag.info
--- radioactivity_orig/plugins/radioactivity_flag.info	1969-12-31 19:00:00.000000000 -0500
+++ radioactivity/plugins/radioactivity_flag.info	2011-06-28 23:47:57.912254200 -0400
@@ -0,0 +1,6 @@
+name = Radioactivity Flag
+description = "Integrates the Radioactivity module with the Flag module."
+package = Radioactivity
+core = 6.x
+dependencies[] = flag
+dependencies[] = radioactivity
diff -u -r -p1 -N radioactivity_orig/plugins/radioactivity_flag.module radioactivity/plugins/radioactivity_flag.module
--- radioactivity_orig/plugins/radioactivity_flag.module	1969-12-31 19:00:00.000000000 -0500
+++ radioactivity/plugins/radioactivity_flag.module	2011-06-28 23:49:01.780907300 -0400
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ *   Integrates the Radioactivity module with the Flag module.
+ */
+
+/**
+ * Implementation of hook_help().
+ */
+function radioactivity_flag_help($path, $arg) {
+  $output = '';
+  switch ($path) {
+    case 'admin/help#radioactivity_flag':
+      $output = '<p>'. t('Adds energy via the Radioactivity module to (un)flagged content.'). '</p>';
+      break;
+  }
+
+  return $output;
+}
+
+/**
+ * Implementation of hook_radioactivity_info().
+ */
+function radioactivity_flag_radioactivity_info() {
+  $info = array('sources' => array());
+  foreach (flag_get_types() as $type) {
+    $info['sources'][$type] = array();
+    foreach (flag_get_flags($type) as $flag) {
+      $info['sources'][$type][$flag->name] = array(
+        'title_placeholder' => t('Flag @type as @name', array(
+          '@type' => $type,
+          '@name' => $flag->title,
+        )),
+      );
+      $info['sources'][$type]['un '. $flag->name] = array(
+        'title_placeholder' => t('Unflag @type as @name', array(
+          '@type' => $type,
+          '@name' => $flag->title,
+        )),
+      );
+    }
+  }
+  return $info;
+}
+
+/**
+ * Implementation of hook_flag().
+ */
+function radioactivity_flag_flag($event, $flag, $content_id, $account) {
+  module_load_include('inc', 'radioactivity');
+  if ($event == 'flag') {
+    radioactivity_add_energy($content_id, $flag->content_type, $flag->name);
+  }
+  elseif ($event == 'unflag') {
+    radioactivity_add_energy($content_id, $flag->content_type, 'un '. $flag->name);
+  }
+}