diff --git a/spaceapi/sensors.py b/spaceapi/sensors.py
--- a/spaceapi/sensors.py
+++ b/spaceapi/sensors.py
@@ -18,9 +18,9 @@ ALLOWED_SENSORS_KEYS = json.load(
          encoding='utf-8')
 )
 
-RADIATON_SUBKEYS = ('alpha', 'beta', 'gamma', 'beta_gamma')
+RADIATON_SUBKEYS = frozenset(('alpha', 'beta', 'gamma', 'beta_gamma'))
 
-get_identifacation_key = partial(first, keys=('name', 'location'))
+get_identification_key = partial(first, keys=frozenset(('name', 'location')))
 
 
 def set_value(data, key):