http://204.234.22.1/SDGI/Westridge/elements/Radium.html
from there to http://wild-turkey.mit.edu/Chemicool/elements/radium.html
Resulting in: melting point=973.2 K , boiling point 1973 K
http://tqd.advanced.org/10676/Period/ra.html
Information valid for Ra-266: Melting Point: 700, Boiling Point: 1737, (units unknown).
http://phycmt2.sogang.ac.kr/~smshin/physics/curri-sub/periodic/ra.html
Melting Point (°C): 700, Boiling Point (°C): 1140
http://www2.shef.ac.uk/chemistry/web-elements/nofr-heat/Ra.html
Melting point 973 K, Boiling point 2010 K
http://wulff.mit.edu/pt/Ra.html
973 Melting Point, K
1413 Boiling Point, K
http://setec-astronomy.mit.edu/chemicool/radium.html
melting point 973.2 K
boiling point 1973 K
http://chemlab.pc.maricopa.edu/periodic/Ra.html
Melting point K 973
Boiling point K 1809
http://www.lv.psu.edu/rxg1/pertable/radium.html
Melting Point (° C): 700.05
Boiling Point (° C): 1699.85