的确是个很大的数字。战时动员能力真强。谢谢鼓励。

发文之前我努力查找这个数字也无法确定。

1，按照 ohiohistorycentral.org/w/Manhattan_Project 中介绍的是：
Eventually 130,000 people participated in the Manhattan Project.

2，blog.nuclearsecrecy.com/2013/11/01/many-people-worked-manhattan-project/ 说：
over 560,000 people left their jobs on the Manhattan Project by December 1946. 还说：
I don't think it's too far off to assume that probably half a million people were employed to make the bomb.