We read with great interest the letters from K. Mossman and B. E. Leonard. They comfort us in our scientific challenge of the LNT. During the past two decades, the LNT has become a dogma that has introduced preconceived ideas in radioprotection and blocked or slowed down its necessary evolution. The main purpose of the French Academies report was to initiate a large debate on the LNT and more generally on the biological bases of radioprotection. This debate is now open, and these two letters enrich it.

B. E. Leonard's letter brings new pertinent arguments against LNT. His conclusions regarding low-LET radiation are consistent with the data that we discussed in our report. However, we would like to point out that for radionuclides emitting α particles, the surveys carried out in workers contaminated with radium or patients injected with Thorotrast have not detected an excess...

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