A careful article forthcoming in the American Journal of Lifestyle Medicine by David Hemenway, a Harvard professor who wrote a brilliant book a few years ago reframing the gun debate as a public health challenge, makes clear that a gun in the home makes you much more likely to be shot — by accident, by suicide or by homicide.

The chances that a gun will be used to deter a home invasion are unbelievably remote, and dialing 911 is more effective in reducing injury than brandishing a weapon, the journal article says. But it adds that American children are 11 times more likely to die in a gun accident than in other developed countries, because of the prevalence of guns.

Likewise, suicide rates are higher in states with more guns, simply because there are more gun suicides. Other kinds of suicide rates are no higher. And because most homicides in the home are by family members or acquaintances — not by an intruder — the presence of a gun in the home increases the risk of a gun murder in that home.

So what can be done? I asked Professor Hemenway how he would oversee a public health approach to reducing gun deaths and injuries. He suggested:

• Limit gun purchases to one per month per person, to reduce gun trafficking. And just as the government has cracked down on retailers who sell cigarettes to minors, get tough on gun dealers who sell to traffickers.

• Push for more gun safes, and make serial numbers harder to erase.

• Improve background checks and follow Canada in requiring a 28-day waiting period to buy a handgun. And ban oversize magazines, such as the 33-bullet magazine allegedly used in Tucson. If the shooter had had to reload after firing 10 bullets, he might have been tackled earlier. And invest in new technologies such as “smart guns,” which can be fired only when near a separate wristband or after a fingerprint scan.

We can also learn from Australia, which in 1996 banned assault weapons and began buying back 650,000 of them. The impact is controversial and has sometimes been distorted. But the Journal of Public Health Policy notes that after the ban, the firearm suicide rate dropped by half in Australia over the next seven years, and the firearm homicide rate was almost halved.

Congress on Wednesday echoed with speeches honoring those shot in Tucson. That’s great — but hollow. The best memorial would be to regulate firearms every bit as seriously as we regulate automobiles or toys.