Chernobyl disaster

Today we learnt about the Chernobyl disaster and had to give you three facts 

1. Sweden actually sent out the first alarm
2. Radioactive lodine is the first killer
3. Radiation in Chernobyl is relative

4 letter word with 4 pictures

1. Look at the pictures and guess the 4 letter word

2. Leave your guess in the comments

3. Click the link for the Answer